In my imagination, the optimal antibots for use against the current generation of tiny drone (like converted commercial quad copters), are miniature versions of

In my imagination, the optimal antibots for use against the current generation of tiny drone (like converted commercial quad copters), are miniature versions of WW1 and/or WW2 era fighter planes, armed with automatic guns in the 3-5mm range. If accuracy gets good enough, the cost of shooting down a drone may come down to $10 or so worth of ammo, and unlike robots catching other robots using nets, these could shoot down serveral enemies before running out of ammo. The problem is that I don't know how to prevent these drones from being able to fire at humans, if the software allowed it.