Don't get me wrong, Hitler and the nazis and especially all the bystanders who ignored were all awful, but literally nothing good comes from some foreign countries meddling in other countries politics.

Imagine France decided trump was evil and they would get rid of him and suddenly Macron becomes the leader of the US. Yeah people will be happy that trump is gone, but imagine what happens next: people are mad because they are essentially controlled by a foreign power, their political system just gave weight to some other guy and now the nazis will rise up again because they feel like they need to "liberate" their nation from "the chains of foreign forces" and "make the country strong again". And this is only national reactions. No one knows what France constitutes as "a dictator". Maybe Canada is next? Now they have to build defenses against hostile actions like this one. And because France did it, maybe Spain will copycat, and maybe they might pick Portugal just because they would love to indirectly control it. And now you have to justify why that's different than Russia trying to "purge a country of Nazis", you know, stuff they are literally using right now to justify their war of aggression.

What I'm trying to say is any countries business is their own. Otherwise every foreign invasion is suddenly up to interpretation and that's just a bad ground rule for geopolitics.