That's incorrect.
Their views are welcome. But if they choose to take their ball and go home because they can't handle any sort of criticism, that's on them and not anyone here. You seem to really want to say this site is an echo chamber although I'm not sure how you arrive at that conclusion. It's you looking to stack the site with like minded posters, no one else. In the case of Masato, he didn't like the shit he was getting here so he literally retreated to his own site.
3 of them are all inclined to believe, errrr, "ask questions" about every conspiracy that comes across the internet. Enock was cool as fuck, and his threads were always a pile of fun, and he gave no fucks when people would talk shit. He was just always an infrequent poster. In the case of Sparkuri, he liked him some conspiracies, but was very easy to shoot the shit with. He and I often disagreed with each other, but we've always had a mutual respect for one another. I'm pretty confident that his lack of activity as of late has nothing to do with "being run off". In the case of Masato, his graphic design work/comics are second to none. But his posting content was indefensible, someone like Enock or Sparkuri could have defended it, but he couldn't and ran to the comfort of a website he has full control over instead of asking himself some harder questions. Ultimately I'd welcome all of them back without issue, I didn't have any personal issue with any of them to begin with. In the case of Swole, he won't take yes for an answer. Some people simply refuse to be accommodated.