I hear there is research that says corporal punishment lowers the IQ of children. Well the red states do want their kids to be dull followers. I am happy to live in a state that outlaw this barbarism.
I "hear" there is research that says T-Rexs were capable of playing the guitar.
People aren't saying that kids should be punched in the face for not doing their homework, or even returning to the kind of comparatively barbaric corporal punishment you were likely to encounter when I was at school. But pain is an awfully effective means of capturing someone's attention, and it leaves a lasting reminder. Furthermore, the way the 'injuries' students had sustained were presented (as if they'd been taken by a coronor) was overly sensationalised (and most likely doctored) to make people relate to the abuses Abu Ghraib prison became notorious for when they saw the physical consequences of corporal punishment.