Agreed they can be weaponized. The United States has turned it into a fine art. My early point is that it would be difficult to take out a group of people with a drone bought off Amazon.
It's purely a matter of weight. Specifically payload. The $10K drone I posted earlier was large, but even it couldn't carry a Claymore mine...which would be a great anti-mob device detonated 50 feet overhead. Still, it'd not only take a large drone to carry it, but the explosion would destroy the drone.
Holy shit what about this one?
That can do a lot of damage.