This question may seem silly. I want to know the reason why using a left hand during our daily life and in rituals. I have even seen some people who say not to accept anything with left hand. Some also say while you are wearing something new like a shirt or shoe, insert your right limb first. There are some parents who force their left handed children to change to right. Lord Hanuman enters Lanka with his left foot first as an enemy. I'm aware of that story. Arjuna was an ambidextrous person (see this question for more) . But no one prevented him being a left handed and none punished him. More over many of us admire him due to this quality.
Can anyone say why people prevent their children to be left-handed?
Please post answers with valid reason but not with generalized reasons. There is a similar question with accepted answer but it does not cite scriptural references.