I dont know the full case, and don't bother looking into it tbh
... but, as an admin to a forum with a lot of different members, you really can't satisfied them all. There WILL be heat and you WILL be in the middle of it. We had it happened too on both forums and it is unfortunate of course, but you need to set up rules and you need to follow up on them. If you really believe in the forum and what you stand for you take it like a man. Learn from it, and move on. If you feel it's unjustified, why should one rotten apple be the reason for your forum to shut down? If they keep on and you asked them to stop, ban the f**ks. Oh almost forgot .. do NOT keep discussing with people. You're the admin, your last word is law, simple as that (of course you need to be reasonable
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Again, I dont' know anything about this particially case, just saying ...