It seems to me that common sense was on its way out the door just as "time outs" were on the way in. I remember a church minister (a.k.a. a "social engineer") at a Christmas cocktail party 25 years ago telling me - as my first daughter was a month away from making her premiere - to make sure I never spanked the child. I remember saying something about minding his own business, sparing the rod & spoiling the child, and I think I might have even mentioned that advice from someone whose parenting experience was limited to reading books was pretty shaky, and I probably had a few other responses. He decided to go elsewhere to impart his "vast knowledge and sage advice" on someone else.
In those days, it was quite fashionable to condemn anyone that might lay a hand on their child as being abusive. Mind you, that was in the politically-correct suburbs of Toronto, where everyone seemed to have an opinion on how other people should live, and they weren't too shy about expressing it. As time went on, I was able to witness the fruits of their efforts...the pre-school and early grade school classes were loaded with kids that said the most surprising and disrespectful things to their teachers.
I guess my take on spanking is that some kids need it, and some don't. I was one of 4 kids, and I seemed to "need it" more than my older brother. I'm sure I was spanked twice as many times as him, but I later figured out that his listening skills were on a slightly higher level than mine...when he was told to refrain from bending the spokes on my bicycle wheels with one of Dad's hammers, he would comply. On the other hand, I was prone to keep on doing it until said spokes were completely removed. This would be cause for a spanking.
I think I eventually figured out that if I did what I was told, behaved myself to a reasonable standard, showed some respect for other people and their property, and didn't back-talk people who were older than me and/or in charge of the situation, then I would avoid a spanking. It took a while, but the spankings eventually ceased.
I think it worked for me.
I have 2 daughters...one was only spanked once, as I recall, while the other was a bit more like her Dad...took a bit longer for things to sink in, but they did. She always understood the reasons for the spankings, and they were never administered with raging anger, but certainly with a sense of firmness and purpose.
I think spanking is one way to get the child's attention (usually a last resort thing) and helps them to ultimately understand the difference between right and wrong. Used selectively and with thought, spankings are a very helpful training tool, in my opinion.
Of course, it's up to the parents as to how they feel and what they do with their own kids in terms of their upbringing.
My opinion is that the vast majority of parents would not abuse their children, but there are exceptions where real abuse takes place. I'm not talking about spankings as I've known them, but physical punishment and abuse. That's a horse of a different color and needs to be dealt with by society. Going overboard and making spanking illegal ain't the way though. Sweeping legislation as a response to a problem of limited scope has a habit of causing many other problems, such as unbalancing the authority/responsibility ratio of a parent's job.
Hell, some people should probably never have children but I've never been able to come up with a practical suggestion as to how to manage that one.