Earlier quoted context omitted.
I find it interesting that the first passage offends you so much. I support gay rights and would really like to see gender taken out of the law altogether, but Card's philosophy there seems unarguably true. People have lots of natural impulses that society expects them to control, so whether homosexuality is natural or not doesn't matter . Homosexuality would be no less acceptable in my eyes if it were a choice. The…
I actually don't find it offensive (though I obviously disagree with it) as much as I find it oddly recognizable: What he's trying to do throughout the entire linked text is proliferate the notion that homosexuality is in fact a choice, in that homosexuals can supposedly chose to control their sinful desires at no greater personal cost (but possibly even personal gain), whether those desires be genetically predispose…
He's a Mormon! Two of the core dogmas of that religion are that (1) procreation is a duty, and (2) raising children well in a family is a duty. What you have to understand is that Mormons have remarkably low hypocrisy and cynicism. They give a lot of public lip service to procreation and family values, and then they go home, when nobody is looking, and make lots of babies and raise big families.
So they take it rather personally when a fringe political group (the tiny but loud homosexual lobby) tries to indoctrinate kindergartners that "it's my body and I can do whatever feels good", or hands out fisting kits in high schools. Mormons don't object to this because they are so fearful that their minds are diseased (phobic), but rather out of the belief that those activities do not make a strong basis for a society. (And they have a point. San Francisco's inverted population pyramid has even the secular authorities alarmed. If SF wasn't fascinating enough to attract enough a flood of immigrants, it would be Detroit with queers.)
Mormons are also very big on conscious self control of all appetites and lusts in the service of long-term goals. They don't just say "smoking is bad, mmmkay", they don't smoke. (The tobacco lobby does not diagnose this as the disease of tobaccophobia and hold My Lungs, My Choice rallies.) I suspect that this is the actual reason the Mormons and queers are so allergic to each other: the Mormons tend toward a very low time preference (long planning horizon) and the queers a high time preference (live in the moment). It is almost a law of nature that someone with high time preference will throw a hissy fit when lectured on moral choice by someone with low time preference.