there is nothing wrong with rebelling. if peoppe want to have fun and that is their way of having fun, leave them be. it gives challenge to the CT team, which they try to maintain control. there's no rules for T besides general rules, and use of armoury/secret past 2:30. people dont want to be CT, nor do they need to unless stated by staff.
i don't see why you would be mad at the Ts. if they prefer to play as a T, yhey do what they want. like it or not, it's the T's way of playing jb after all. i myself when playing T like to "rebel and shoot people" as i see it being fun.
another answer to the topic question above, maybe people see a 2v15 being fun, balance will always be an issue, as there is no way there will always be people who want to play as CT. maybe the people who do swap to CT don't like playing as it themselves. it all goes down to the player, and their opinion
i play pub, but it's never as populated as jb. you should play pub @Vatts