If you already compare it to real life Mr. Reddy, then tell me what happens if I try to escape prison after I was put into it, 1 day before I ger released? Yea 10 Years on top!
Yes, you stay more in prison (if you get caught). But i guess no action will be taken if it's guards fault or anything that is not related to you. For example, if there is an earthquake and walls are down, you won't have more years on top.
TL;DR
you don't get punished for escaping if it's a security problem.
U can't leave someone somewhere and say to him not to leave, you gotta make him stay there (or at least do what you can)
Edit: don't expect me to stay in prison if there is no security. Same with this case, he joined cuz it is a security problem (no they say) and it's not in rules.
At least make a rule which states that if you are kicked in server with reason banned, don't enter server again cuz its against this rule.
Feel free to discuss with me in steam or PM.