First of all, spanking a child has been and continues to be the leading form of behavior control since we were beating the shit out of the bitch in the next cave over, mounting her and then dragging her by the hair back to your own cave to cook and raise your kids.
Everyone needs to quit acting as if they stand on higher moral ground. Every one of you has done something in your life that, if allowed to be sensationalized in the media, may be abhorrent to others in our or another culture. For fucks sake, give someone a thumbs up in Korea and see what happens to you. How many times have you heard good people and fabulous parents tell their children they're going to get a whack if they keep it up? "You're gonna get it", etc... The threat alone is usually enough. I'm sure sometimes it's not.
The point is, it's not now and never has been your call to judge the actions of another parent. That type of discipline has been woven into the fabric of our society since time began and only now because news outlets are getting all kinds of mileage out of a single incident, your appalled? Get over yourselves, none of you are that good of a person, myself included, to pass judgement on the guy in the first place.