[A_PLUS]

Lets assume picking Hitler would have facted stopped the Holocaust, and turned WWII into a minor European event (not true, but just play along).

Would you still pick Hitler, knowing that...

The U.S. never goes to WW2, no Baby Boom, etc, etc.

So...
There is a good chance that
-You ae never born
-Your Friends, GF-Wife, Allen Iverson, etc are never born
-The U.S. is far from an economic-military super power, and your standard of living could be much less


Basically, you can stop one of the greatest tragedies in history, at the risk of ending or ruining your life