[jammies]

Knives were never originally designed for killing. They were used as tools, just like they are mainly used today. Do you think in the Stone Age you ran after a deer with your knife and tried to kill it? Were there brigades of knife men fighting in the wars of the Middle Ages? No? Is it perhaps because a knife is not a particularly good tool for killing as compared to something with that express purpose like a gun, or a spear, or a bow and arrow?

It's a stupid argument and a complete red herring. You can use all kinds of things for killing, unfortunately humans are extremely inventive that way. That doesn't mean it is futile to try to keep killing a choice that requires commitment and effort, and not just grabbing a handy tool to go do it with.