You'll never get a hundred people in a room to agree on this one and here is no different. All you can do is state your stand on spanking. Then if you feel the need to you can justify it. But I'd imagine that exercise is more for the benefit of the 'has smacked' parent.

Nobody will change anyone elses mind, because would you want to admit (in hindsight) you really shouldn't have hit your child twenty years ago? That's an admittance I am yet to see, although I believe deep down in someones conscience they cringe at the memory of their palm connecting with their off springs flesh.

I haven't hit my children, because I think it is lazy discipline. If it was a sure fire way to educate kids it would be commonplace in our education system. But I don't feel anything negative about those who do choose the lazy route. Your flesh and blood - your call how you treat it. And your conscience to live with.