but it may be news to creationists. And I know the subject has already been dealt with by numerous others.
Really creationists? That’s what you’re going with? Really? Well OK, if that’s the approach the religious creationists want to take, I’m happy to debate that point. There are (at least) three reasons why this isn’t a valid argument against evolution. Each one by itself is enough to sink this ridiculous creationist canard. They are:

Hitler wasn’t inspired by evolution

was religiously inspired.

so what?

Hitler wasn’t inspired by evolution
Evolution is a process where favorable mutations are selected by nature – that is, mutations that make it more likely the organism will reproduce, will be passed to offspring. Although the phrase “survival of the fittest” has become popular, the idea that this means “only the strongest survive” or that living beings fight each other for survival (and so only the strongest survive), is false. “Fittest” actually means “most able to reproduce”. That sometimes means “the strongest”, but in social groups (such as primates), “fittest” can also mean “well regarded by the group”. For example, a rogue early hominid, who murdered his peers, might well have been excluded by the group and (therefore) would not have been able to reproduce.

Hitler’s solution was the opposite of allowing nature to select. Hitler’s approach was to artificially remove groups of people he didn’t like, from the gene pool, in what was undeniably a sickening version of selective breeding, as practiced by farmers for around 10,000 years before Darwin. If Hitler learned of the opportunities of such selective breeding from anywhere, it was from farmers’ knowledge and experience that predated Darwin. Which means that Hitler’s final solution was, if anything, an example of intelligent design. he wasn't inspired by Darwin, he was

religiously inspired
If you want to know what Hitler really believed, a good place to look would be what he actually wrote in his plan for the revival of Germany - Mein Kampf. Get a load of this:

The best characterization is provided by the product of this religious education, the Jew himself. His life is only of this world, and his spirit is inwardly as alien to true Christianity as his nature two thousand years previous was to the great founder of the new doctrine. Of course, the latter made no secret of his attitude toward the Jewish people, and when necessary he even took to the whip to drive from the temple of the Lord this adversary of all humanity, who then as always saw in religion nothing but an instrument for his business existence. In return, Christ was nailed to the cross, while our present-day party Christians debase themselves to begging for Jewish votes at elections and later try to arrange political swindles with atheistic Jewish parties-and this against their own nation.

Not convinced? Try this:

Hence today I believe that I am acting in accordance with the will of the Almighty Creator: 'by defending myself against the Jew, I am fighting for the work of the Lord.

There’s a lot more of the same in Mein Kampf, and in other speeches Hitler gave, if you can stomach reading any more. It doesn’t sound to me as though Charles Darwin was much of an influence. In fact, I haven’t been able to find even one mention of Darwin or the theory of evolution in Mein Kampf. Not one. Now, isn’t that strange? Don’t you think that if Hitler had been influenced by Darwin that he would have mentioned it somewhere in his book? Why wouldn’t he?
No. Hitler’s ideas of the superior Aryan race were quasi religious mythology based Christian and/or occult beliefs. This is what inspired the extermination of the Jews – not evolution.

The Holocaust was not the first time there was mass persecution of the Jews. It's been happening century's before Darwin. 2,000 years in fact, all because of antisemitism in the bible. http://www.sullivan-county.com/news/mine/timeline.htm

In 431 C.E A group of monks sweep through Palestine, destroying synagogues and massacring Jews at the Western Wall.

414 C.E St. Cyril of Alexandria expels Jews from his city.

538 C.E The Third Synod of Orléans decrees that Jews cannot show themselves in the streets during Passover Week

1010-1020 C.E In Rouen, Orléans, Limoges, Mainz, and probably also in Rome, Jews are converted by force, massacred, or expelled

1096 C.E Massacres of Jews takes place in the First Crusade, destroying entire Jewish communities in Mainz, Speyer, Worms, Cologne and other cities. The Jewish chronicler reports: "The enemies stripped them naked and dragged them off, granting quarter to none, save those few who accepted baptism. The number of the slain was eight hundred in these two days." The chronicler GuibEvolution leads to atheism leads to eugenics leads to Holocaust ert de Nogent reports that the Rouen Crusaders said: "We desire to go and fight God's enemies in the East; but we have before our eyes certain Jews, a race more inimical to God than any other.

1247 C.E Pope Innocent IV defends the Jews: "they are wrongly accused of partaking of the heart of a murdered child at the Passover... Whenever a corpse is found somewhere, it is to the Jews that the murder is wickedly imputed. They are persecuted on the pretext of such fables... they are deprived of trial and of regular judgment; in mockery of all justice, they are stripped of their belongings, starved, imprisoned and tortured"

1320 C.E The "Shepherds' Crusade." A Christian chronicler records: "The shepherds laid siege to all the Jews who had come from all sides to take refuge... the Jews defended themselves heroically... but their resistance served no purpose, for the shepherds slaughtered a great number of the besieged Jews by smoke and by fire... The Jews, realizing that they would not escape alive, preferred to kill themselves... They chose one of their number (and) this man put some five hundred of them to death, with their consent. He then descended from the castle tower with the few Jewish children who still remained alive... They killed him by quartering. They spared the children, whom they made Catholics by baptism"

theres many more examples, all of this before Darwin, and his theory of evolution. creationists... do you feel stupid now? or do you still think evolution was responsible for Hitler.

Christians will say that Hitler wasn’t inspired by “true” Christianity (or even by a “True Scotsman”). Well, maybe not. But so what? They try to blame evolution for the Holocaust on much flimsier evidence. Actually no evidence – no link to Hitler at all apart from their own flawed understanding of evolution. But Hitler can be directly quoted using Christianity as a justification for his treatment of the Jews. It was clearly Hitler’s religious or quasi religious beliefs – not an over reliance on critical thinking and science – that inspired him. And these flawed beliefs were combined with an authoritarian streak that demanded respect and unquestioning obedience. Hum… religious or quasi religious, not backed by evidence, demanding respect and obedience it hadn’t earned…
… Remind you of anything?

Christian creationists may live to regret opening up this particular can of worms. In future, every time they trot out this tired piece of propaganda they should have Hitler’s real Christian influence, rationally for the Holocaust and his exact words thrust back down their throats. Evolution wasn’t responsible for the Holocaust. The Holocaust was the result of the exact same kind of unquestioning group think that characterizes religion. Or, to paraphrase the creationist twit I quoted at the top: Religion leads to unquestioning belief in what you’re told by authorities, leads to acceptance of an authoritarian state, leads to eugenics, leads to Holocaust, leads to Nazi Germany.

So what?
Really – so what? Even if it were true that wouldn’t mean evolution was wrong. The argument is just a fallacious appeal to consequences: the truth of something does not depend on the consequences of it being true; the truth of something depends on whether it is actually true or not. Nuclear weapons are terrible things, but that doesn’t mean that Nuclear weapons don't exist. Even if Hitler was inspired by evolution, that wouldn’t mean evolution is wrong. e is always going to equal to MC squared weather you like it or not.

I’m not necessarily saying that Christianity alone was responsible for the Holocaust. Without Christianity, Hitler would probably have found another excuse. But I am saying religious thinking was responsible. And Hitler’s own words lay the blame with Christianity, not evolution. Hey, I didn’t start this.

list of Hitler quotes.
http://www.scienceblogs.com/pharyngula/2006/08/list_of_hitler_quotes_he_was_q.php