Even the leader of the Neo Nazis voted for Biden.
There are more Neo Nazis groups in America than just one. And the particular one you mention was immediately disavowed by Biden.
When Trump was endorsed by the same guy, Trump said nothing until he was pressured to do so.
https://www.businessinsider.com/joe-biden-campaign-disavows-richard-spencer-endorsement-2020-8
The valid conclusion here is not the one you're coming to.
As already explained, this is not equivalent.
Yes, they absolutely would, especially when they're nazis.