We certainly don't need to discuss all the various things people can be or have been kicked for. Suffice it to say that some kicks are just and some are not. Any can, of course, be reported to GMs. And ones deemed unjust are actionable. Beyond that, though, GMs' current tools do not allow them to undo the kick. So if a troll unjustly kicks another mentor, that mentor still can't rejoin for three hours, even if the GM outright bans the troll's account. This post just officially represents the recommendation to implement a tool allowing GMs to undo the restriction at their discretion.