You seem to confuse some things here. This server is not open source, controlled by the people. It is paid/scripted by a few private people and made available for free. This means, whoever pays/scripts the server, decides who can play here and who doesn't. In our case, these few people chose admins, to control the server so the voluntarily established rules are kept.
But still, you have no enforcable right or anything like this to enter or use this server. It's a gift not a duty to give you access.
When an admin decides your behaviour is interupting the others or is rule breaking, he will cut off your access. And as the server is technically private, he doesn't have to prove anything.
I would suggest of you can't commit to simple rules or take orders from admins, you better search for another server (without admins, rules and other players...).