I was rarley hit as a child (I can remember twice, once when I punched my brother, and another time when I lied) and I don't think it's right unless the child really screws up. Violence just breeds violence. When I punched my brother what did them smacking me back teach me? Kind of contridictory if you ask me. I'm not a violent person at all, although I have a mean yelling shriek.
My brother was a REALLY hard child, and my parents resorted to smacking him. It accomplished nothing. If anything it made him lash out even more. My mother was beaten as a kid, and as a result she ended up pregnant and hating her parents by the time she moved out. Their relationship still isn't the best. My aunt spanks her children (not very hard) and I also think it's doing more harm than good. They never want to listen and they rebel. I never want to go to their house because of it.
Even when it's necessary to give them a tap (it happens) never should a mark be left. Also, I think emotional abuse is also bad and people need to start looking into that. I wasn't majorly emotionally abused as a child but my mother was no where near perfect. She channeled her anger through words rather than beatings like her parents did, and I don't recommend that. It does a number to the child, even if it's not physical.
Final answer: No, it shouldn't happen and I don't plan to spank my children. Other things can be done even with the hardest of children.

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