If you’re looking to have a public forum, you need a representative sample from all sides of the political spectrum. Look at parliamentary systems as an example of that, where you have literal fascists and communists sitting alongside one another as a very vocal, but incredibly small minority. If that’s your goal, you need to take the good with the bad.
That is what Musk has stated as his goal, so what you’re seeing makes absolute sense with that stated goal.
That said, I don’t like Musk or what he claims to believe in politically, I just think the idea of an open town square is desirable. I hope someone can pull it off (doesn’t seem like Musk is doing it), which is part of why I’m working on a Reddit/Lemmy alternative that discourages echo chambers and encourages high quality discourse. Doing that is incredibly hard, because people like to group up into tribes, and I think Musk absolutely does that as well (hence why I don’t like him). However, I don’t think Musk is a “Nazi” because he allows Nazis on his platform, I think he’s just incapable of running the type of social media platform he wants to see exist.