My parents have never spanked me. My dad has never employed any form of violence or even angry attitude towards me. I know well that teaching kids through love always renders better results than teaching kids through violence. If you can't deliver your point in a better way than through violence towards a little defenseless creature, then perhaps it is you who isn't quite qualified?
Appeal to experience is silly. People interpret experiences in different ways. A parent who has raised 10 children the wrong way still knows less about parenting than someone who has never had kids and has the right ideas about raising them.