>>931220If you mean that all weapons derived from tools you're right.
The Fairbarn Sykes design is optimized for stabbing into flesh and, more importantly, easy to pull out again. If you stab someone with a knife and the blade has the same thickness from tip to pommel, it will create a vacuum making it hard to pull it out.
The double edge allows a more frictionless entering of the body, which is also important because the blade would wander towards the direction the edge is facing, because a dull spine creates more friction.
This could result in miss of the targeted organ for example.
I think it is up to one's own ethical standpoint to call this a weapon or a tool lol.
Knife sperg over and out