German was the Nazi State in the WWII. It's one of the most strongly integrated countries in the EU. What does that have to do with anything? History should be remembered but we're not playing 2022/3 by the rules of the past. Generations come to fix the errors of past ones, otherwise what are we all doing here?

Germany was saved by the Americans (Marshal's Plan, look it up) so it could become a vassal state, which it still is to this day. With or without the Nazis, it does not matter to Uncle Sam. Just look at Ukraine.

"Generations come to fix the errors of past ones, otherwise what are we all doing here?"

Well, they aren't doing a really good job in Croatia, are they?

Slovakia is already in Eurozone and Schengen. Probably not same level as Ustaše and not openly celebrating faschism but there is party full of neonazis in parliament there.

In what way do they openly celebrate fascism in Croatia?

Ever heard of Thompson, the rock musician? People there love him.

Well, he has a knack for singing praises about Ustaše. Those guys were the best friends of Hitler's Nazis during the WWII.

There was also a large anti-fascist movement in Croatia during the Second World War: https://en.wikipedia.org/wiki/Croatian_Partisans.