Yay, interwebs 80 years latter psychiatry.
Nobody knows what was his part of sanity, and it hasn't the slightest importance to give a judgments on his acts.
Libertas is probably right that had Hitler succeeded, he would have been regarded as a hero in the West.
Besides the fact that remaking History is one of the most, if not the most, pointless thing.
Ah yes?
Humanity, or at least Europe wouldn't care about the 1st industrial mass murder in History which happened on its territory?
Daring, to say the least.
West was already recognizing the fact that slavery was bad, and slavery wasn't even direct murder, then Holocaust...
The only ones who wouldn't care of Holocaust today, or who would ultimately contest it are, either marginal (some white supremacists in West and former USSR, and some new World Order kind for the most part), or come from regions that haven't directly been concerned by it and who have an issue with Israel seen as a present given to Jews by West to apologize for Holocaust in the detriment of populations that had nothing to do with Holocaust (that is some anti-zionist movements in some Muslim countries, but here too it remains marginal movement, not populations).
Then the only one who wouldn't recognize it would be marginal in West and some movements which also remain marginal from part of regions which didn't live it and which have an issue with one of its consequence. It's not like it's something that could that easily be skipped, and each time it is, it is because of some extremism and/or ignorance and/or passion.