Incredibly enough, Cassavetes truly hits on the problem in his little diatribe about incest. "If you're not having kids, who gives a damn? Love who you want," he says. And he's right. If relationships aren't supposed to be about the next generation -- if they're designed specifically for fulfillment of sexual desires -- there's no point to monogamy as soon as it becomes burdensome. That's why the divorce rate skyrocketed in America in the 1960s, as the view of marriage shifted from a child-centric one to a fulfillment-centric one. Marriage used to be about the other -- a spouse, a child. Now it's about you. And the Rolling Stones are wrong - you can always get what you want. And if you don't, well, you simply change up relationships.
Incest isn't the final stopping point for the sexual left. The final stopping point is pedophilia. All it takes is for the left to declare that children have the ability to make rational decisions about their own sexuality. Then the final string tethering Western society to her Judeo-Christian moral roots will be severed. And Hollywood will celebrate.