From that other thread:
If I belong to a country club, there are certain rules I have to follow on the golf course. If I start cussing at the group ahead of me, piss on the 18th green when I have a bad round, they kick me out. I broke the rules. Same thing with the Church. The Church is following its own rules-- you commit an excommunicable offense, and you get excommunicated. You want to not be excommunicate? Repent, and quit committing that offense. You know what the rules are, and if you’re not willing to abide by them, then you’re not a member of the Church. Start your own Church, or find one that better aligns with your views. People do that all the time.