Because large-scale killer *anything* attacks are extremely rare outside of active warzones. A swarm of explosive quadcopters may be cheaper than conventional warfare, but it’s still beyond the capabilities of any individual psycho and even most terrorist organizations. Mass murder tends to be as simple and cheap as possible -stationary bombs, lone gunmen, knife attacks, hijackings, etc. – because these things can still get the job done without requiring enough in resources and coordination that national security agencies find you and shut you down.
Fundamentally, there’s just not enough interest in the indiscriminate killing of civilians, either on the part of governments, non-government organizations, or individuals, that the “industry” has any call for that level of technological sophistication.
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