I can provide two specific examples of "widely held beliefs" that have been mass-banned on Reddit. I also want to note I don't endorse or subscribe to either of these beliefs but I felt neither were deserving of a ban and I was open-minded to hear arguments in their direction.

1) Reddit banned /r/NoNewNormal and "Covid misinformation" after activist moderators started shutting off subreddits. I personally got a Covid vaccine and complied with mask regulations, but I was interested in hearing coherent arguments related to lockdown / mask / vaccine skepticism. Obviously these skeptic views were very widely held beliefs, and some of them like the "lab leak theory" went from "misinformation" to "possibly true"

2) Reddit banned /r/GenderCritical which was a subreddit representing feminists who expressed skepticism over modern transgender ideology in the spirit of JK Rowling. Again, JK Rowling has millions of followers so this qualifies as a widely held belief. While I want to be inclusive and supportive of transgender people, I'm interested in hearing skeptical arguments related to things like whether it's really a good idea to give puberty blocker to teenagers .

I believe both of these bans happened not for good reasons but because of ideological crusades from Reddit power-moderators who skew heavily on certain political and ideological topics.

I'm not trying to start a flamewar or debate on either of these topics, I'm not endorsing either of those subreddits, I'm addressing your critique that specific examples were not provided of "widely held beliefs" that have been unfairly censored.