Why do you think some cultures try to force children to be right-handed? Do you think this is a good idea or not? Why?

The reason that some cultures try to force children to be right-handed is they think left-handedness bring bad luck to them. Another reason that they don't want children using the left-hand is that they think if children use their left hand, they won't fallow the rules.
In my own opinion, Prohibiting children from using their usual hand is not a good idea. We should let our children fallowing their nature. Children have infinite possibility. If we change them to use the other hand, they may become someone that they would not want to be.