Ironically you are violating another recurse center social rule in saying this: no feigning surprise, i.e. just because something is obvious to you doesn't mean it is obvious to anyone else, so don't act surprised when someone doesn't know or understand something.
Because everyone has had their own experience that they have learned from. Most people who do this are not trying to be a troll. They really have learned A lesson and want to help you by sharing. The problem is few people have the context to know all the important issues, they just know they were burned badly one time and want to save you not realizing that the solution they found has downsides that will burn the other guy.