There's so much that's wrong with this. I got my share of spankings as a kid. None with a switch or a belt. I remember some of them but don't remember a damn thing about why. Since I was a repeat offender I can only assume that I wasn't really taught anything or dissuaded from further bad behavior.
I was lucky with my son. I only "spanked" m'boy twice – once when he was playing with the dials on the gas stove and the other when he was running toward the street and he thought that we were playing "I'm gonna getcha." His language skills at the time were minimal at best. He was still in diapers and the gentle swats had no physical effect, but the look in his eyes at my strange behavior told me all I needed to know. He didn't mess with the stove or run into the street ever again.
Hell, a tone of voice is often all that's needed. There was a time, when he was older and had acquired some language skills, that he was being a pain in the ass at dinner. I told him to go to his room' and he did ... sorta. He made it to the landing on the stairs and collapsed in a crying heap, begging to come back.
My wife and I looked at each other, slack-jawed, and both declared "We've become or parents!" I waited about 30 seconds then headed up the stairs to talk with him and bring him back to the dinner table.
He ate everything on his plate without another word or whine.
I know that it isn't easy, but this sickens me.