Manner reveals his matter. When you ask someone to help you to do the dishes, you can tell whether he really wants to help or not. People worshipped idols because they wanted to control their deities. Or they could get the sun god to behave by a few quick libations. Hands are unique.
Hands are different from the other limbs of the body.
The other limbs of the body are fixed and static, whereas the hands may be lowered lower than the feet or raised higher than the head. He can commit the greatest sins possible. He can murder. He can steal. Everything can be done with the hands.