Dual use is the default, not the exception
Almost every useful security tool is also an attack tool. The question was never whether to build dual-use technology; it is what you owe the people downstream of it.
ethics
The expensive part stopped being the munition
A first-person-view quadcopter with a warhead taped to it costs a few hundred pounds and destroys a vehicle worth several million. The airframe is a toy, the radio is a toy, and the only component that was ever hard is now a model that fits on a board you can buy. That is a cost inversion, and cost inversions do not reverse.
