I think many people have been bullied into claiming they support it because they see what can happen to you if you don’t.
That’s a very real problem but I suspect it will be eased as we begin to experience “gay divorce”.
I know a lot of gay people(yes I do) who got married simply because it was trendy. That’s a bad reason to get married.
Marriage entangles a lot of things. This is particularly true of people prone to bad choices in life. Your lover’s $40k in credit card debt is now your $40k in credit card debt. If he finances a car, that debt belongs to you now.
One of my college friends wants to get married RIGHT NOW but his partner refuses because he has a ton of family property. And he sees no reason to get married.