Imagine if Hitler was removed before... Instead, foreign powers favored appeasement and trade; conservative elites thought they could control him, Nazi propaganda and terror consolidated power, and Germans were disillusioned with democracy after WW1.
I'm still not convinced removing Hitler before his invasion of Poland would have been a good idea, it seems possible someone like Himmler would be just as capable of picking up Mein Kampf as an ideological framework to continue imperialism and kick off genocide. "Look what the Jews and communists did when we tried to stand up to them, they killed the leader of our movement," etc etc.
Once the genocide started though I do thing all considerations, including national stability and continuity, are lower priority than ending the genocide as fast as possible.
I shouldn't bite but are you seriously saying Maduro had Hitler-like potential to ignite global war if we didn't stop him?