I think most of it is trolling. For whatever reason we have 12b it is what it is.
Nordberg just got banned for 12b (again). Is Nordberg a pedo? No, at least I don't think so. I didn't read the post that got him banned but I'm willing to guess that someone introduced the subject and Nordberg responded...and here's the psychology you asked for...Nordberg responded in kind, and got banned (again) for responding to a troll.
I don't wanna see conversation about child porn period but it's pretty obvious that this rule is being abused. People get riled up and in the heat of the moment try to smack the troll and end up getting banned. I have to admit 6 months without Nordberg is not a bad thing but I seriously doubt he deserved it, maybe banning for fishing for 12b violations might be a refreshing change.