Have you ever been in a house that had something just egregiously wrong with it?  Something massively unsafe and uncomfortable and against code, but everyone in the house had been there a long time and was used to it?  “Oh yeah, I almost forgot to tell you, there’s a missing step on the unlit staircase with no railings.  But it’s okay because we all just remember to jump over it.”

Some people are like that missing stair.

When I posted about a rapist in a community I belonged to, although I gave almost no details about the guy except “he’s a rapist,” I immediately got several emails from other members of that community saying “oh, you must mean X.”  Everyone knew who he was!  Tons of people, including several in the leadership, instantly knew who I meant.  The reaction wasn’t “there’s a rapist among us!?!” but “oh hey, I bet you’re talking about our local rapist.”  Several of them expressed regret that I hadn’t been warned about him beforehand, because they tried to discreetly tell new people about this guy.  Others talked about how they tried to make sure there was someone keeping an eye on