Maybe just take them away from their abusive parents, keep them out of the horrors of WWI and provide a better society for them to grow up and live in which isn't facing crippling post war sanctions. For as evil as Hitler turned out, a lot of that was probably shaped by the environment he grew up and lived in. And the environment in which he rose to prominence and power was not something he set up. While it might seem an easy solution to snuff out baby Hitler, and in no way am I trying to excuse what Hitler did, it's entirely possible that someone else would have done the same things, if Hitler didn't exist.

If we want to not have horrible, mass murdering fuck-heads, we need to create societies which don't promote the creation and elevation of mass murdering fuck-heads.