Except mental health issues are more prevalent in the LGBT community, and in fact is a major reason for increased substance use within that subgroup [1].
If declining mental health was the reason straight men weren’t having sex, we’d expect to see the same/worse declines for gay/bi men too.
You cannot become part of the LGBT community outside of being an ally by choice.
You either are gay, are lesbian, are bi, are trans etc or you're not and opting in to all the social bullying outside of the sub-10% LGBT (who themselves are not that united) who will now supportive on principle makes very little sense.
These issues among LGBT people map pretty much exactly to the pattern of mental illness and substance abuse that exist in every minority out-group. Far more likely that this very obvious explanation is the true one.
Sure. There is totally no porn induced autogynephilia in solitary people with untreated mental issues that makes them believe that they are transexual, and the faux acceptance of the LGBT community totally does not lure them in.
The faux unconditional acceptance offers solace, often to marginalised people that haven't received it from anywhere else.