Planes were used in the world wars, then we have 9/11. This is the post 9/11 era where air travel sucks so much.
Similarly:
Drones are now being used in the Russo-Ukrainian war. Eventually, there will be a “9/11” with multiple coordinated drone attacks and then the way drones are treated will be forever changed. Civillian ownership of drones will likely be heavily restricted or entirely banned.
History rhymes.
Terrorism is all about terror.
Imagine a major league football or baseball stadium packed to capacity. Two or three drones, each with a relatively small explosive charge surrounded by shrapnel fly in, crash into the spectators, and detonate. You end up with a small number of immediate casualties like what happened at the Boston Marathon. But the stampede of tens of thousands of panicking people trying to rush out of the stadium will probably injure and kill many more. Have a car bomb or two strategically located a couple blocks away where you expect those crowds to run and you’ve succeeded in your terror plans quite nicely…