Which require a lens. I saw the pix, and the cams are indeed
quite high, but I still contend that a well placed paintball
will foul the lens, regardless of control boxes on the ground.
Shoot the camera head with a paintball - a difficult shot at a small object about twice the height of a utility pole, and whatever agency runs the system cleans it up within a couple days. Sure, you can keep messing up the lens - and they can keep cleaning it up, probably eventually giving up on it.
But shoot that ground-level control box (see photo) - an easy shot at a big target - with a deer rifle, and its $10,000+ in electronics are ruined and a complex repair is needed. Best of all, you can do it from hundreds of yards away - out of the spy camera's vision!