Bossk please don't tell me you never broke the rules in life ever?
Did you never speed in your car? Should you be banned from driving for life for breaking a speed limit?
Cheat on a pointless test at school? Be banned from school from when you did it and not be allowed a proper education?
Banning people permanently is pointless and beyond the purpose of it. Punishing people is for 1 purpose, to aid in them learning from their mistakes, that is why in the majority of walks in life, nothing is permanent in terms of punishment. Be that sport, school, minor offences, drink driving, even murder.
Serial cheats and you have a point.
Ever heard of lifetime prison or death sentence ?