I have two Dutch roosters now. They are so friendly and they love to be cuddled. I hope they won’t turn evil. They are 6 months old nowI had the same experience with a bantam rooster. I was the only person he attacked and he was brutal; one time a bent down to do something in the yard and he sneaked up on me and went for my face. He got my ear and it bled heavily for a long time. The guineas didn't like him and used to keep him in line if they were around.
We debated culling him but I was sure he would take revenge on me, I'd probably choke on the meat if I cooked him. In the end, a local wild animal culled him for us.
A few years later, I had another bantam roo that was okay with people but killed a large, full sized rooster. Luckily a coworker took him.
So I agree with the others. Unless you want to carry a broom around every time you go outside, he should go. He will only get worse.
BTW - I don't keep bantams any more because of those 2 roos. Has anyone else had that experience with them?