The purpose of a hammer--and here we'll go with a ball peen, claw, or sledge, not a warhammer--is to hammer in nails, hit chisels or punches, and break inanimate objects. It can also be used to kill someone, but that's not its actual stated purpose. It's not built to be a weapon.
A mind-control spell's actual, stated purpose is to take over someone else's mind, thoughts, and emotions and deprive them of their free will. There is literally no other purpose for a mind-control spell. In fact, they literally can't be used for any other purpose.
Do you understand the difference here?