As a child psychologist I am very aware of the detrimental consequences of spanking a child. I know that you are probably an extremely lazy parent who cares nothing about facts. You would rather just spank the kid then teach them. That would take effort and education on the issues. Its clear to see you are a very uneducated and angry person. They don't learn good communication skills. I would like to say your post is a poster child for this reason. They learn that when someone does something I don't like I hit them. They never learn alternative ways and a strikingly large percent end up with assault and battery charges later on. They come to fear their parents and feel helpless. Their self esteem is decreased so drastically they begin to believe they do not deserve to be treated with respect. There is no difference in hitting/spanking a child leads to hitting a spouse. In fact more then 90% of domestic violence cases involve a woman who was spanked as a child (I was bad mom hits me, I was bad husband hits me) that is one reason they stay so long. Husbands have an even higher percent of spanking because they don't have the skills to solve a problem without hitting. A child can not understand the difference of why you can hit them but they can not hit the kid who took their toy. They grow up to feel bad about themselves. There is NOT ONE study that shows spanking is NOT HARMFUL. Of hundreds of studies the results are clear it is damaging. This is fine for someone to selfish to care what is best for the child and wants the easy way out. So you just keep on doing what you are doing. But the fact is you are permanently leaving scares on your child and lowering their chance of happiness and success in life.
I will share an example from my own experience. When I was in college I worked at a day care center. One day a young boy asked his younger sister to come play with him. She was with another little girl and said "no." So the little boy walks over and slaps her butt. I asked him why and he said "She wouldn't listen to me. That is what mom does when she does not listen."
I really do not think I could make this any clearer.