Edit: Why the negs? I'm not saying which side I'm for. I think this is a really interesting question. There's arguments for both sides. So please state why you pick a side so we can all learn more.
Well I wouldn't because Hitler was a mistake, and we learn from our mistakes. If Hitler was dead, there would be no Pearl Harbor, No World War II, it would be different then it was back then.
There's actually a book about this I think. A women was back in time and was taking care of baby hitler and she had to choose whether or not to kill him
The ends don't justify the means.