> So long as a post is on topic and not abusive or threatening, there is zero reason to remove it. But Reddit has become a place where mods curate their userbase into a nightmarish echo chamber, quash all dissent, and then use it as a bullhorn for their own ideologies.

Ideology has nothing to do with it. The post could be flamebait, have a bad title such as "Give me recs", a clickbait title such as "Does anyone else hate Popular Thing", be easily satisfied by searching the subreddit, etc.