Question

Why does the president only need a right-hand man and not a left-hand man.?

Answer 1

Forcing them to change hands and write right-handed can have very bad effects in later life as well as being traumatic at the time and ruining their handwriting! ... Changing the hand used for writing causes great confusion in the brain and can have a lot of knock-on effects.

Answer 2

A right-hand man is a trust-worthy person, a confidant. It's not really correct to say, “left hand man”. ... Along time ago, the right hand was always considered better than the left hand. There's a phrase in the bible, “seated at the right hand of God.” In fact, the Latin word for left is sinister.

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