@gilette No, @ThatGuyThere is right, that sort of stuff does happen in the real world too. That doesn't make it right, but it does happen.
Student bodies and clubs are the best example I can think of, as by their nature they'll rotate membership every three to five years as people join and then graduate. The identity and purpose of any given group of students can change entirely based on the agenda of new students joining.
Back when I was still in college, I joined the "Japan Appreciation" committee/group/hangout/student body, whatever you want to call it. It was basically a private room with a TV and a huge library of anime and manga on shelves. When I joined, it was still true to its roots. There were only about twenty of us, so between classes maybe only four or five would ever be in the room at the same time.
One year before I graduated, freshmen showed up with a Nintendo 64 and asked if they could use the room to play Smash Bros when we weren't watching anime. They paid their membership fee and all so we didn't see a problem with it, so long as it didn't disturb the people who came to watch anime or read manga in peace.
Over the next few months, those freshmen lured in more and more of their friends and would spend increasingly alarming amounts of time playing the game. The ones in charge, like me, were too busy with graduation projects to settle disputes and through our neglect the anime and manga club became the Smash Bros club, unofficially. Old members left over it, new ones looking to play the game came in droves.
By the time I'd graduated, one of the freshmen had become head of the club due to there not being anyone else with the drive to do anything left, and policies changed drastically to put a bigger focus on gaming than the club's original purpose.
If they'd followed proper procedure, they would've made their own group/club by going through the school's administration. With their own room and TV they wouldn't have had to disrupt another group. But: the application process for getting a new student group approved and funded was notoriously harsh at the time, not to mention unfriendly to people who just wanted to play video games while at school. It was easier for them to invade the one club that already had a TV.