While doing drugs and engaging in rampant promiscuity are things I don't really condone, inciting hatred, bigotry, ignorance, and possible violence is on a whole other level.
Ah, but that is Card's entire point. Gay "marriage" would apply those standards of behavior to child rearing. The predicted course of events is as follows:
1. Gay "marriage" is approved.
2. Billy Cornhole goes to the Mineshaft club, drops enough Ecstasy to make a rabid wolverine feel friendly, and spends all weekend screwing anything warm that moves. And a few things that are cold and/or non-moving.
3. Billy wakes up Sunday evening to find that he is married. To whom takes a while to remember.
4. Billy and spouse get into an epic cat fight about something silly a few weeks later and part ways. Billy finds that divorce is expensive, time consuming, annoying, legally risky, etc.
5. Billy successfully lobbies, by a combination of threats and charisma, to make divorce instant, cheap, and zero risk. And he would indeed be right that, given the adaptation of marriage to gay sybarites, divorce must also be adapted to be fair.
6. A generation of people are indoctrinated by the leftist propaganda machine that this is how divorce should be used in our brave new anything-goes society.
7. Those people grow up and do what they were taught: they act as if marriage, and therefore children, are disposable inconveniences.
It is not bigotry or hatred for Card to say that this is cultural suicide** and should be stopped. If he is wrong or misguided or improbable, then the gay leaders should explain how and discuss the matter logically, rather than vilify and terrorize their campaign opponents. Instead it appears as if many of the gay leaders cannot imagine that anyone would think screaming, puking babies are one of the greatest goods in the universe, so they incorrectly infer that their opponents' actions must be personal attacks, and therefore leap to personal accusations of bigotry and hatred.
**Remember that the Spartans did not meet their doom in battle or plague. They neglected fertility and child rearing, in a context of homosexual indulgence, and gradually just faded away.
It is also worth noting the history of the Mormons (Card is Mormon) for those who do not know. Due to their sexual unorthodoxy (polygamy), in the mid 1800s they were cast out of mainstream American society, driven away with naked violence, and exiled to parts ever more westward, ending in Utah. As a result, they tend to have a natural sympathy for underdogs and outcasts. However their history also gives them a powerful devotion to family and and its preservation at any cost, a devotion that is not simply a tradition but codified in writing. It is the latter motivation that the gay "marriage" advocates are bumping up against and (deliberately?) misinterpreting as bigotry to stoke the fires of their political movement.
We should also note that, in many jurisdictions, gays already have civil union laws that their lobbyists can modify to their hearts' content, and such laws are inevitable in virtually all jurisdictions. They can already get legal sanction for behaviors mundane or outlandish. The battle for recognition and support is over: they won. Gay "marriage" is not about supporting homosexual households and families, it is about forcibly remaking marriage for all people as an act of cultural aggression.