If I were going to argue this side, I would do so by arguing from tradition. In other words, I would argue that the evidence of past traditions shows that corporal punishment is not a bad thing.
I would argue that generations of children were subjected to corporal punishment and did not come out of it in any way warped by the experience. I would argue that there were actually fewer discipline problems back in the old days when corporal punishment was more common.
Finally, I would look at the evidence against corporal punishment and I would try to pick holes in it. I would argue that social scientists cannot really prove that corporal punishment causes resentment or that it causes kids to become more violent. I would argue that there are all sorts of other factors that play into how a kid will behave.
So I would argue that A) corporal punishment didn't ruin kids for generations and generations and B) that social science is an imprecise thing that cannot definitively prove that corporal punishment is bad.