By making a decision and putting yourself into the position of entering the pitch, then you are taking the risk of being banned. Every supporter of all the clubs in Scotland know this sort of behaviour isn't acceptable regardless of the outcome of a court case. Rangers clearly state this within the Season Ticket T&C's as previously noted in this thread.
In the defence of the club why should they allow a supporter who has entered the pitch, the potential to be cautioned or charged by the police represent them as a fan at other grounds again when this type of person is a clear risk to the club.
We don't see the financial consequences that occur to the club when this type of incident happens, large fines and increased costs to arrange more policing/stewards at games etc.
Posts on here keep referring to "Innocent Until Proven Guilty" If you have received this letter then at some point in that match your detail where provided to the police who have then relayed his onto the club. So in the clubs eyes you are guilty of breaching their T&C's. So really there's no one to blame other than the individual who enters the park.
Though if the Hibs fans could have celebrated like all other clubs do, then we wouldn't have had this issue.