Some other EU countries have had their own struggles helping Nazi Germany, and some still have parties that support far-right characters. That doesn't mean that the countries themselves are led by nazis. Furthermore, as the guy above mentioned, the leadership of Ukraine never followed through to regard this guy as a hero today. However, I find the following quite interesting:

A poll conducted in early May 2021 by the Democratic Initiatives Foundation together with the Razumkov Centre's sociological service showed that 32% of citizens considered Bandera's activity as a historical figure to be positive for Ukraine, as many considered his activity negative; another 21% consider Bandera's activities as positive as they are negative.

So, right before Russia invaded Ukraine, people were against this guy. However, as soon as Ukraine's independence was threatened by the same entity that this guy advocated against, people changed their opinion. The poll was taken immediately after the invasion, which would be a bit of a confounding variable here.

I chalk it up to socio-economic issues due to the Soviet Union, which led to poor education in many areas of Ukraine. See East Germany, where a majority of people have voted for AfD. Oh, and let's not forget the overall negative sentiment against Russia after they invaded in 2014.

Nevertheless, would you argue that invading Ukraine to "denazify" them makes sense in this context? You mentioned atrocities from WW2, but that's not being done today. Whatever deaths that were happening pre-2022 conflict were due to the Donbas War, which Russia also instigated. What reason would you then have to support Russia in this conflict? It is pretty clear that they are pulling in many arguments to justify their expansionist wishes.

Don't get me wrong, I am also of the opinion that the US should gtfo of Europe, but I do not see a reason to excuse whatever Putin's regime has been doing.