Would you kill baby Adolf Hitler?

There is no definitive proof that the world would've been better without Hitler. A minimal knowledge of history at the time will bring other potential, perhaps even greater threats to one's mind.

Let's say Hitler never existed - or that he died as an infant.

Japan, Italy, and let's not forget about Russia, probably were on their way to create WW2 sooner or later anyway.

And of course, the high ranked officers and politicians who were behind Hitler would still be in that Hitler-less world.

All the people involved with Nazi Germany still would have been Nazis. Obviously, someone else than Adolf Hitler would've taken the lead. Maybe the party's name would've have been different. Maybe some of their ideas would've been slightly different. But the core would still have been there. Hitler didn't come out of nowhere; his ideas and also his hatred were shared by many, many people in this region. This includes antisemitism. Hitler simply had a tremendous presence, was a formidable orator, and unearthed the people's anger. Nothing proves no one else could've done the same.

So, I don't believe a world without Hitler would've been better. As a matter of fact, I'm not sure if we would be able to talk so openly today if it would've been the case.

Hitler, despite being one of the most powerful men on the planet during the 30's and early 40's, was quite unstable as a human being and this affected everything he took control of. Including military decisions.

It can be assumed, on a certain scale at least, that Nazi Germany's defeat is the result of Hitler's unstability. Now imagine if someone like Erwin Rommel - who wanted to get rid of Hitler - would've had more control over Germany because Hitler wasn't there. Rommel was an experienced WW1 veteran, was an extremely cunning, mentally stable man, a great strategist, and his respect towards his enemies kept him from underestimating them.