Is that your view or do you have evidence this is so? What about being gay wrecks a marriage? Are you assuming these people are sneaking out to have sex? That's a trait that isn't unique to homosexuality.
Are gay men unable to love their wives and children? Are these men happy enough in their lives that even though they harbor sexual desires and thoughts for the same sex they can be happy in an opposite sex relationship?
What about women who just want a "normal" life and to live right perhaps in the eyes of their family and God? Are their lives "wrecked" as well?
Again orientation is not behavior and is not necessarily who you love.
If you can't be with the one you love, love the one you're with. It's trite but it does work.
God, just shut up dude. No one cares what you think.