I'm speaking in terms of averages and likelihood. Of course some gay people are completely normal and well-adjusted. But why join the community when it puts you at dramatically elevated risks of these outcomes?
BTW I don't buy the "trauma" excuse. Returning male veterans have an alcoholism rate of around 10.5%. They actually saw stuff. They suffered painful injuries on the job. Gay men, by and large, just had parents and older relatives who disapproved of their life choices, and that's more true of the older generation than the younger one.
Anecdotally, my relative didn't even come out until she was already living in a faraway state and was embedded with an uber-liberal peer group. And yet, I hear often that she uses pot and I heard a rumor that she's tried even harder drugs before. I don't believe this is true of any other family member, and I come from a big family.
Here's another explanation:
The average single man might, hypothetically, have sex with hundreds of random women if the opportunity were to present itself. But (most) women understand that sex with strangers is a risky business, so they're picky about who they do it with, which curtails the ability of the average single man to do so.
Men have lesser inhibitions in this regard, so two gay strangers will happily screw each other. When they congregate in big cities there's a vast pool of willing lovers with whom to have one night stands or 5 minute bathroom sessions. They engage in risky sexual behavior every day, and become addicted to it because it's just so pleasurable. We saw this with the AIDS epidemic, where gay men could've quite easily protected themselves by settling down in monogamous relationships with each other, but by and large they lacked the willpower to bring themselves to do that. I once saw a photo of an all-gay choir, with like 20-40 people in the picture, and all of them were dead by the end of the 1990s. Apparently not one member of this large group was willing to get off the gravy train and stop having endless buttsex with strangers. Or heck, just abstain from having sex for like 10 minutes if they didn't have a condom on hand and needed to go get one.
One risky behavior lessens their inhibitions about other risky behaviors. It's a crazy thing to stick another dude's Donald John in your mouth, but if you're willing to try that then you're willing to try other crazy things, like party drugs. Gay men, like and often overlapping with the pool of drug addicts, often develop what's called a high time preference, meaning they choose instant gratification over delaying such to build a better life for themselves in the future. I'll concede that this is also kind of, sort of true for most straight people but gay people take this to another level.
These are not the values that lead to a sustainable human civilization. And as these values spread, everything will go downhill.
