It's not even people being offended that creates the rules a lot of the time. If you don't have strict and clear cut rules, it's going to eat up a ton of mod time trying to keep out trolls and people asking the same things repeatedly in bad faith. I liked the split that was on Reddit between an asktransgender group and the groups meant for community.
For me though, I've just never wanted to be in that particular kind of place as a trans person. It takes a lot of energy to constantly answer the unintentionally offensive and invasive questions from all the people in your family, job, and just general day to day life. It's hard to find people who consistently can and want to give time to helping slowly warm people up to the same basic facts that they could find on their own.
I'm not saying it implies that. I'm saying that trans people and established research both say that. Your minimal experience with one of the detrans subreddits is not more substantial of a source than first hand accounts and peer reviewed papers.
Did you spend substantial time in /r/detrans and /r/actualdetrans? Were you aware of drama around when that split happened? Discussed it in the other trans communities on the sites? Because right now, your comments make it seem like you're a passerby who has popped into a trans community and tried to say that your interactions with one community known for astroturfing are more meaningful than decades of research.