Here’s why many people assume those who think homosexuality is “morally deplorable” are closeted gays:

In order to think something is immoral, you must believe it’s a choice. One cannot be morally responsible for something in which he has no choice.

So if being gay is morally wrong, then gays are gay by choice, i.e., they could be straight, but they give into the temptation of being gay.

But many straight people (like myself) have zero temptation toward being gay. I have temptation toward women other than my wife, I have temptation toward foods, alcohol, nicotine, etc. but zero toward being gay. Just not a thing I need to resist. So being straight in my case is not morally correct because it is not a choice.

So when you morally judge others for being gay, it sounds like you are saying you were able to make the right *choice* while they were too weak. Which sounds like it was a choice for you, which means you are tempted to be gay, which basically means you are kind of gay. Not that there’s anything “wrong” with that — because that you are kind of gay (tempted) is not your choice.

Not commenting on any particular people in this thread, just explaining why it’s not weird that those is consider gayness moral depravity are assumed closeted gay by many. (And many who have done so historically have turned out to be closeted gay.)