> Sure you can. This is the purpose of laws and law enforcement. Try to fly a drone with a knife to stab people and people will destroy it and arrest you.
There are lots of drones in the Middle East killing people with much more dangerous weapons than knives.
> Both Antarctica and outer space are military-weapons-free
This is a fairly academic point given the US is capable of nuking anywhere on earth that anyone could possibly want to nuke. There aren't weapons in space because the purposes of putting weapons in space are achieved by other means.
There are lots of drones in the Middle East killing people with much more dangerous weapons than knives.
> Both Antarctica and outer space are military-weapons-free
This is a fairly academic point given the US is capable of nuking anywhere on earth that anyone could possibly want to nuke. There aren't weapons in space because the purposes of putting weapons in space are achieved by other means.