Tools have allowed humans to evolve above all other life forms, as humans are quite physically weak compared to other animals. Chimpanzees do not weigh nearly as much but are able to tear our limbs up with just their bare hands, and can hang off trees off day. In comparison, the average human can barely do a few pullups.
Thus we started with melee tools to help us in hunting and defense. Unfortunately, while the tool does give an advantage, it doesn’t make the wielder stronger. If someone stronger grabs the tool and tries to take it away, you are still at their mercy and the tool isn’t going to help you. In such a case, it can be turned against you.