It's maybe worth noting explicitly that "more LBGTQ people coming out of the closet" and "society is decaying morally" are not the only options. E.g., it could be true that being LGBTQ is fashionable, or that certain sexual appetites used to be seen as perversions and then as preferences are now seen as identities, but one can believe either of those things without regarding them as morally bad. (You could say it used to be that being straight was fashionable, or something-like-fashionable, and there's no obvious reason why it should be morally worse for being, say, bisexual to be fashionable than for being straight to be fashionable.)

[EDITED to add:] I hadn't noticed Dagon's quite similar comment when I wrote this one. If I had I probably wouldn't have bothered writing this, but I think our comments are sufficiently not-identical for me not to delete this either.

You should separate the question of whether to applaud or boo from the question of causality.  I'm not sure why someone would go from "this is now more accepted" to "society is decaying morally", and IMO that idea should be fought separately.

I think the recent increase in acceptance and respect for LGBTQ persons works on a number of causal pathways - it brings people out of the closet, and it encourages curious or unsure people to try it out.  I don't really follow your comment about "sexual appetites" as if they were unrelated to identity, but I don't really understand identity so I may just be obtuse on that point.