It's a joke about how Zoe, a high school teacher, doesn't understand how her brother can like teaching kids all day, but at least he kids won't shoot up the school. High school shootings are a notable thing that has happened in the States (Columbine, etc). It seems pretty clear to me that it's flavor with some dark humor and is no way trying to imply that there are teenagers in the mafia or whatever.That flavour's pretty weird. Why does it talk about kids bringing in guns? I don't think this makes you mafia, but I think you're hiding something.
As for suspects outside of Drac and Athena, thegrovylekid and IE stand out to me as potential "fly under the radar types". I've also townread CJ and Muffin for a while, mostly because they seem to genuinely contribute when they post.