Leave Allers banned. He's a dick and his unban essay doesn't show any remorse for the fact he was banned in the first place, or any caring about OTHER PLAYER'S FUN, which he ruined countless times with his trolling/griefing.
What other people say has no bearing your feelings unless you let it.
That being said, Allers would do a lot of shit in game to try and piss people off. He's one of those people who will have a friend on the enemy team, and they would just stand next to each other, or dance around pretending to fight. If someone on his team came up, he'd let the enemy attack his teammate without trying to stop them. I honestly thought he came across as an angry person, but either way, you shouldn't get your jollies from trying to upset other people in a video game. If that's how you enjoy the game, then you're playing it wrong.
Seen Miley do this, and quite a few other people from time to time. That's one of my biggest pet peaves playing cRPG, but I got nothing personal against them. Especially if you're cavalry and they're just hugging each other, if I go to attack the enemy, I'm going to hit my teammate (who's literally hugging the enemy). I enjoy playing with Miley and like him as a person, I just hate when people pretend to fight the enemy or start punching them instead of finishing the job.
I say unban and let his actions speak for themselves (and grow some thick skin if what someone says is upsetting you, it's the internets).