A lot of people think that what they do in the privacy of their bedroom (or dungeon space) is a personal matter, just between them and their partners. However, too often, society at large and our clueless coworkers / vanilla neighbors makes judgments and pass laws that make our activities criminal.
Sometimes things aren't quite so grave and you might just feel the need to come out when there are a misconceptions or misinformation out there (bdsm=abuse, for example). Coming out can be a very empowering thing. It means you don't have to hide your preferences anymore be they for someone of the same gender or for someone to spank your ass.
Many of us, before we found forums like this were alone in our desires. It was only because of the brave ones who came out with munches and leather events that we realized that we were part of a vibrant community. Maybe now, it is time for us to step up and come out for those who are following us.