Go to the archives, there was a pretty good set of discussions about this having been a primary player in causing the net loss to the list, the ensuing lent made sense
Its not a matter of censorship or "safe spaces" It was generally a consensus among members of the community that certain trains of discourse can result in a negative outcome for the community as a whole. Self policing helped. There is plenty of room for chatter and noise, but some topics trend toward an explosive outcome and some of us drink....alot