I don't see spanking as being excessive violence or a slap on the check either. I'm not convinced that they would always be effective but I'm not strictly opposed to their use. But some parents have, can, and still do take things to the next level and thats where its traumatic and abusive and excessive and causes far more harm than good.
Its gone too far to one side right now...and if anything happens to some parents kid its always everyone elses fault and their kids never take responsibility for their own actions and the parents don't take responsibility for their actions in bringing up the kid. The taking of responsibility is a big thing for me.