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They're afraid!
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The amount of weight a drone can carry is pretty limited. And the low tech easily made at home explosives are fairly heavy.
However, even if it was viable, the 1% will have everything right down to paper airplanes made illegal.
Russia uses armoured ground drones that look like mini tanks with armor resistant to bullets. They are used as explosive suicide drones. While there are large quadcopters for payload applications, this is the easiest delivery method.