this is probably not the best argument, because DEFCON has been this way since the beginning (I have been to a lot of them) and the security community as a whol

this is probably not the best argument, because DEFCON has been this way since the beginning (I have been to a lot of them) and the security community as a whole has never really been accepting, forgiving, or inclusive. so when you make a post that says "your community stinks and I won't be a part of it", the majority response will be "good, we didn't want you anyway". maybe you could point out that the community loses a lot of potentially awesome contributors by being so exclusive, but the community will be quick to point out the large number of awesome contributors they already have, and how those contributors themselves are prickly, women-hating and exclusionary, and they'll be right. in short, I don't know what you can do as an outsider beyond ignore it. as an insider, those in the community who agree with you are in the minority, and generally disinterested in engaging with the majority of the community because they are terrible (and also generally quite stupid). I don't really have a long-term interest in being associated with the security community, and am not at DEFCON this year for that reason. it's a weird, insular and perverted thing that has marginal societal good. the societal good that comes out of computer security is often not connected to what you conceive of as "the security community", but rather professional researchers and engineers that work for universities and major corporations. so, my advice is, ignore the "security community". it will die. let it die.