At one time or another...
stones/rocks, chipped/shaped, sharp or otherwise (earliest documented murder weapon was a rock)...
large bones...
pointy sticks (hand held)...
Pointy sticks with better points on the end...
Longer pointy sticks...
Pointy sticks shot from something...
rocks shot from something...
Blades of stone, shell, bronze, iron, steel...
A wide variety of blunt and edged instruments...
Primitive agricultural implements...
animals...
slings...
slingshots...
blowpipes and darts (little pointy sticks dipped in stuff)...
chemicals...
chemicals used to propel objects into/through a target and the devices which enabled that, large and small...
germs...
unstable atoms...
have all been used as
weapons of war, and those are just the fundamentals...
You can't ban them all, and even if it was successfully done, there are still hands and feet.