Plus how many times have we been out in public and hear a Parent screaming at their child, as the child does what they please....., just saying.
2. If punishment of a child is not working, the child has no respect for authority of the parent, or adult who is charged with their care. Find out the problem for that lack of respect and fix it, while the child is still impressionable. Otherwise, they will never amount to anything as an adult, and will probably wind up abusing children themselves.
I don't think using a switch or a belt is discipline. I feel like if you have to get to that point that you are using some type of instrument to hit them, that is bordering to abuse.