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While the first two points are somewhat ambiguous, the remaining points are quite clear. I think all of them should be kept. The reason is simple: if a moderator simply deletes messages without any punishment, there will inevitably be people who decide to spite him by posting more irrelevant content, engaging in trolling, etc., just to annoy him, since he deleted their post, let him keep deleting. But the moderator won't be able to punish them.