It only takes one complaint, as I witnessed. Stats don't mean a thing. When GD is more likely to be targeted. Subject matter can be acceptable in most circles and then somebody has a complaint. For example: Families watch more sex and violence through media sources in one single day. And they happily invite it into their homes, no big deal to them!
Something can be posted in GD, its content is pretty much benign. Then some "enlightened soul" happens along and find its something they should complain about 5years later. Being there is uncertainty where things and what will be acceptable or not. Simply saying, the best as I see it, is not to share any more in my ongoing post I see how it could be targeted. Also, makes me gun-shy as to post any new threads here.
Your second paragraph is what caught my attention. Have seen where a perfectly legit thread got derailed (locked) by a member(s) who had no concern to those who contributed before them about the thread subject matter. As far as I am concerned: It's OK to have some lateral movement in a thread posting, such as humor, fact checking, brain fart, whatever as long as it's not going to be a totally out of order distraction such as personal attacks that are separate from the OP's thread. Hey, I'm not saying I'm some angel, but some are really out there, that don't cool it. Unfortunately when some of these blitzes go on, the thread get's shut down. It's at that point I have an issue with Matrix for it's the sum total of contributing posts are punished for the actions of a rabid lone wolf or two. In that case it's a darn shame. Often felt it was not a good forum policy. Sure wished that the offending party had been shut down instead of having the entire thread shut down.
I have to agree with Zap that there is a certain amount of risk when posting a thread here for there are sometimes unintended consequences that can put the OP in an awkward situation. There's alot of smart members here and for the most part helpful, sincere and have something to offer, which I think is great to see/read.