I've only played the US3 server and I'm not sure whether killing is instant ban on all servers or just US3, I understand KOS isn't allowed but if someone is robbing you and A: You defend yourself or B: You don't comply and they shoot you will you get banned?
on US3 ALL Violence is banned. You hit your friend, your banned. Your friend punches you, hes banned. Not just killing, ANY AND ALL Violence.
All Bans are reviewed by a live Admin.