Just confirming what hawthorne said.
We do prefer to deal with questions about bannings by email, to protect the privacy of the individuals, and to avoid a big hoop-de-doo over nothing. Most bannings are for obvious and flagrant violation of the rules – I just banned and destroyed a post from someone who thought they could sell drugs here, for instance.
There are a few trolls who seem to think it’s cool to appear under multiple screen names (sometimes to have debates with themselves). We usually detect them pretty quickly, and then ban 'em and blot out the posts. It’s sort of like, the content is irrelevant when the source is unacceptable.
If you’d like the analogy, evidence is inadmissable if it was obtained from an illegal search, no matter how compelling or damning that evidence might be. Similarly, opinions from flagrant violators of our rules are deleted, no matter how interesting or coherent those opinions might be. (I know, it’s a poor analogy, but what the heck, and who moved my beer?)
Anyway, when it comes to trolls, and your question “Where’s the line?” … it’s here: ______________________________