I'm going to ban a guy from my Minecraft server.
What did he do? Why are you going to ban him?
Someone has to discipline that guy, or I can't take it anymore.
You shouldn't ban people from somewhere unless they are doing something to disturb other people. Taking out your own personal grievances with someone by banning them is wrong and will make people view you in a negative light. If he is actually bothering everyone on the server, then banning him might be the right thing to do though.
I'm going to ignore his cries for help and the bans will never be lifted.
But what has he done that's so wrong?  Wouldn't you feel bad restricting him from having fun with you? Why not just give him some warnings so he can understand what to do in order to properly have fun?