I am saying that on average, the people I've met who were swingers were less insecure and had higher self-esteem than the population at large. I threw in a hypothesis as to why that might be to add to the discussion. I don't see what is so controversial about that. With respect to self-esteem and self-confidence, I would say the same thing about the U.S. Marines, for example (though perhaps for different reasons). If the general population is the gold standard for self-esteem, we are in more serious trouble than I thought. If all sub-groups were homogenous they wouldn't be sub-groups, now would they? Since when was making an honest observation an ideological statement?
I suspect that is only your personal belief. Scientific study, anyone?