So that was you meddling with my timeline and preventing that blonde girl from winking at me at the Second Cup this morning. Bastard.
Israel had not been invented yet, thus, there were no Uzis. But I get the drift. I would have used my iPhone to summon a laser-bearing Zano to waste the entire building. After transporting the hell out of there, I mean.
According to Wikipedia, Eva Braun and Adolf Hitler first met in 1929. Geli Raubal died in 1931.
Hitler and Riefenstahl first met in 1932, so it’s possible she’d be around in this scenario.
OK, but that means that Hitler still killed 6 million Jews in our timeline, as well as having started a war where tens of millions of people got killed.
If we’re doing the many-worlds interpretation of quantum mechanics, there are of course already countless timelines where Hitler is never born, and countless more timelines where he never gains power. What’s the point of creating one more timeline where he never kills anyone?
Other than the personal satisfaction of throttling Hitler, of course. That I can understand. 
The seeds of the Third Reich were sown long before Hitler came to power. Without him, someone else would have taken over. I’d still try to kill him.