THERE HAS BEEN SOME HEATED Discussion lately about how moving Roseanne to 8 p.m. ET is a violation of TV’s traditional “family hour.” What a quaint idea. Look, I don’t want to burst anyone’s bubble, but we left the universe of My Three Sons and Mayberry R.F.D. many light-years ago. Except for Sunday mornings, there are no more protected enclaves on the broadcast schedule. Desperate to attract and hold younger, more jaded viewers, TV now pushes the boundaries of good taste all day long. In most markets, the talk shows start cranking up the decadence at 9 a.m. In prime time, a show like Married…with Children is more emulated than one like Murder, She Wrote. You simply can’t rely on TV to serve as its own chaperone. In other words, if you want to shield your children or yourself from provocative or violent programming, do it yourself.