There is more than one reason to ban a user. One reason is that the user really is a vandal or disruptive type, in which case the chances of him sneaking back to make constructive edits are negligible. The other type is someone who lost a content dispute with the cabal and was banned for that reason. It is the latter case which is of interest to system gamers like Raul654. They want to make sure their enemies stay defeated. Whether this helps or harms the encyclopedia is irrelevant to them.
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