Such an outstanding post which gives importance to manners. Your thinking about management is great, you said we should not be harmful to our children to make them good which will transfer bad characteristics of manners.
We should use restriction on our children to teach them rather beat or torcher them. e.g. If a kid misbehave we should stop giving usual things or not take them where they enjoy after when that child does not repeat the bad manner we should award them which will motivate them towards good things.