The problem with that is that those same children are also homosexual, at least some of them are. 1 in 10? Something like that rate of incidence. It's never "Hey, kids! Be gay! It's FUCKIN' AWESOME!" It's more like "If you're gay, that's alright, here's how to make sure you're safe" to the same extent as straight sex-ed is given.
What you're saying is like saying "You can be black just don't parade around in my city celebrating your blackness." It's not something you decide to be, and even if it was, there's no reason to curtail what they can do with their lives. I think the problem here is that... Pride parades are not about straight people. That's the problem, I think. Straight people against pride think it's so that LGBT can parade around and "show off" to the straights. No, straights don't matter in a pride parade, it's purely and only for LGBT people. It's a place they can be themselves, feel safe, and know that everyone or nearly everyone there shares their perspective, or in the case of allies, doesn't hate them for their perspective. It's why people say "straight pride is every other day" because every other day and every other month is intrinsically celebrating straight people. It's like a millionare getting pissy that some folk down at the homeless shelter are getting some hot food for once.
And... Why wouldn't you let swingers adopt? What, do you think they'll tell the kids to join in? :I Is that what you also think gay parents would do? You *do* realize that being gay is like, a small facet about someone, right? And the only reason LGBT people make such a huge deal out of it is because straight people make a huge deal out of it, with lynching and beating "fags", and legislating against them and making marriage such a huge deal in society and then saying "No, you can't have it, because you're not loving the right person." It's a defense mechanism, taking this one single aspect about yourself and using it as a shield, saying "No, you're wrong, this is who I am, there's nothing to be ashamed about!" But because it's such a small aspect, in day-to-day life, a gay adopted parent won't be focusing on much more on LGBT-related things than a particularly liberal-minded straight adoptive parent. It's only one aspect about them as a person, and as a parent. Plus, there's such a huge problem with unwanted children that telling the ONE DEMOGRAPHIC that is almost guaranteed to adopt if they want kids that "No, you can't have any" is hurting all the homeless and un-adopted youth.
Edit: Bolded because important.