'We' had many chances and opportunities to: whack, kill, 'assassinate' - 'remove' him. But he was such a friggen bonehead that he helped kill more of his own troops that we ever could on our own. IIRC it was Churchill who first said he was 'off limits' and then FDR concurred.
Up until Czechoslovakia he got lucky. Then like all megalomaniacs he thought he was the smartest man alive and completely invincible, so then he pushed for more. Kind of how Barry's been pushing and pushing and pushing. So far he's been lucky too. But pushing SCOTUS will be his 'Poland' (awwww sh_t) moment.
Then again, Uncle Adolph did like dogs and little children, so that's on his plus side.
(HUGH sarcasm)
[if you couldn't tell]
Getting rid of Hitler by going through the WW-II was a really expensive way to do it. A benefit of getting rid of Hitler is that a rational person (if one was to be found in Nazi Germany) would have looked for a way out. Doenitz would have been such a person and Hitler named him as his successor in his political will. It seemed an odd choice, because Doenitz was the least Nazified of the German leaders. Of course, by the time Hitler finally killed himself, no one on the Allied side cared what the Nazi leadership did.
I do not look forward to America’s “Poland Moment”. And American institutions are still healthy enough to resist a real Hitler. It is unbecoming to compare Obama to Hitler, I suppose. Obama is clearly (and sadly) the worst president in American history, but still a far sight better than Hitler.