According to Bobcat Goldthwait, American culture has grown too vicious, too mean, too unfeeling, too rude, and too self-serving for its own good. Frankly, I can’t say that I strictly disagree with him, but that doesn’t make me accept any more readily the thesis of his fifth film, God Bless America, which may be the most intentionally odious picture I’ve watched all year. Tired of the obnoxious and boorish qualities of modern popular consumer culture? Arm yourself and gun down the bigots, hate-mongers, and morons clogging up your television and radio airwaves. Goldthwait’s being cheeky, of course– at least at first– but he’s also in the throes of a blind, murderous…