Yup, it's called a weapon. We've been doing it for a VERY long time. There are some people out there that would very much like to turn you into a corpse or a slave. If you don't want to be a corpse or a slave, along with your family and friends, then you will need them.

If you can find a world where you don't need access to Killing Machines, please let me know because I would very much like to live there.