Mods give a subreddit its norms and structure. If you kick out the mod team and forcibly reopen r/subcultureX, you're not getting r/subcultureX back, you're getting something new puppeting around its skin. If users really just wanted to start talking about X again, nothing's stopping them from going and creating r/subcultureX2. You can't force people to continue donating the massive amounts of free labor that made these communities what they were.