That's a difficult question to answer TNTrulez.
From a philosophical standpoint, the "correct" answer is no, because humans are ends in themselves, and any beneficial outcome cannot outweigh the wrong it does to a person. (Pro Kant, Anti Utilitarianism)
From a realistic standpoint, we have to realize that life incorporates elements of both Kantian and Utilitarian views.
If were honest I couldn't give you an answer that satisfies you and me. While watching the murder of many people might be horrific, it might not be so bad if you sort of blinded yourself to it and reaped the rewards later. It's a very touchy thing, and it's hard to be honest about it, or to figure out which view is correct.
But I'll just say this: if you forced me to choose, I wouldn't let Hitler do that, unless like humanity was at stake or something similar. e.g. if I had a choice between killing a little kid and preventing nuclear winter, I'm saying see ya later to the kid.