Lasers
The military had the idea in the 1980's to use powerful ' pilot incapacitating' lasers (PIL) - during the Falklands war a ship fitted with 'Flasher' was sent down, but the official story is it wasn't used in combat.
The Geneva Convention now declares these systems illegal, but when one's back is against the wall ...
As for idiots pointing at airliners, I can only think this should have a major police reaction, but might involve some hard work.
When using laser designators on a test range, I was first given goggles with sensors which would 'black - out' if hit by laser.
I wondered if the things could work sufficiently to beat the speed of light !
Later we were given what appeared to be modified sunglasses - maybe they should be aircrew issue ?