Well, DUH!!!
Who didn’t see this coming?
Wait until they act in swarms, like a Marine fire team - one C4, one CS gas, one Claymore, etc.
Wait until they start doing this over Ohio or New Jersey.
These things are easy to build from a kit, even easier to buy. Strap some explosives to them and fly them over a school, festival, or sporting event.
Say hello to the Blitz in America.