Topic on All The Tropes talk:How We Do Bans Around Here
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"Tempban, then case by case" makes the most sense in general, in that it's not even always intentional. From previous experience we know there's a whole herbarium of bugs, retarded censorware (remember that guy with a edit-box-wide word substitute?) and probably malware… a short term first ban with stated reason doubles as "time out to fix your crap". If someone has pants on the head obsession or is a jackass, will either get bored and go elsewhere or repeat, if not, fine…