People being the social creatures that they are, they want to fit in somewhere. The problem is that once everyone claiming to be kinky was allowed entry into the clubs there began to be cliques and in-fighting. You had Old School butting heads with The Next Generation who didn't want to be told how they had to do things. The fact is that people like to associate with others of a similar mindset, and once diversity was achieved...well....it actually became harder for groups to maintain any sort of togetherness.
For example, in my own life, if my kinky friends and I formed a group, it would be hard to find topics that applied to all of us and didn't end up in an argument. My friend since high school and her husband are bedroom kinksters. To her, it's all fun and games. She is appalled, at times, that I, a lifestyler, prefer to actually be controlled. In her own words, my relationship is unhealthy. On the other hand, I find her "pretending" in the bedroom to be shallow and meaningless. Then, there's the couple who are into swinging with a little bit of kink thrown in. The wife is the dominant partner. She is also somewhat appalled that I'd prefer to let a man be in control. In her words, I'm a grown woman who can do as I please, and if he doesn't like it...tough shit. Thankfully, our friendships aren't based on kink. We can accept that we have different beliefs, but it's much harder for strangers to walk into a group of people and find acceptance or be accepting of others. It's just human nature.