Anyone who is involved in any sort of children's services nowadays will tell you how many kids are ravaged by casual divorce and unwed parenthood.
I would imagine that very little of those particular problems are traceable to adults who suddenly succumb to the blandishments of homosexuality.
While I have no love for the militant "gay" agenda, let's be aware that most of the "ravaging" of heterosexual families is coming from 100% heterosexuals who don't want to make a family work.
You don't have to imagine anything. There are already documented cases of people who leave their husband/wife/children to pursue the gay lifestyle.
I personally know two people who did this and broke up their families. Their excuse? They had to go 'find themselves.' Never mind what that selfishness cost their children.
Of course, straight people do this too, but it's still not an excuse to be a values-challenged jerk.