Mjolnir is actually the most efficient weapon, ever—capable of inflicting virtually zero unintended/collateral damage, there’ve been times when someone other than Thor wields it and damages exactly what they’ve targeted, yet nothing else receives even a scratch.

Some say it’s the mystic properties of Uru, others think it’s Thor way of coping with anger, but no one’s sure why it only destroys surrounding objects when handled by him.