If you say "personal attacks aren't allowed", they'll say "I wasn't attacking him personally, I just suggested that anyone who says [the thing he said] should consider getting evaluated by a doctor for mental retardation."
At some point you just have to say "I know what you're doing, you're clearly not acting in good faith, and I have to ban you." Are all of those people now potential lawsuits?
This is especially important given google's market power in the browser industry. What if the extension is from Google's competitor? Google could ban the extension without a legitimate reason to hurt their competition.
1) That pretty clearly qualifies as a personal attack
2) There is a significant difference between a forum and a business critical software distribution platform.
Okay, let's take the obscurity up one level: I used to moderate a very small internet forum, where there was one user who had certain mannerisms in his writing. I also had reason to suspect this user was mildly suicidal.
A troll began to mimic these mannerisms as a way to make fun of that user, and talk about how horrible their life was. The troll wasn't overt about it, but if you knew the history between these two, you could tell what was going on. The troll of course feigned innocence, but as he'd been given warnings before, I made the call to ban him.
I firmly believe I was acting within the forum's stated policies—but I am not 100% confident a judge would agree. If these types of actions could lead to lawsuits, I don't know what I would have done.
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> There is a significant difference between a forum and a business critical software distribution platform.
Great—but where's the line? Is Youtube critical, for example?
(FWIW, I appreciate the idea that eventually it would be useful to be able to ban a bad actor entirely from something to exclude the possibility of future harm: the past tense of "correctable" was "avoidable", and it needs to be very clear exactly what was done wrong and what could have been done differently for someone to end up in the situation of being banned from the usage of a platform, service, or business: the alternative where people get to apply secret and obscure reasons to refuse service is madness.)