I think it may be time for we olds to teach the youngs some practical skills in resistance.

Surveillance cameras are a blight. Unfortunately if you knock them down, break them, or spray paint the lenses black you're headed for a rough time. This is because all of these are rather dramatic actions that immediately alert operators to there being a problem; they'll be looking for you because you'll have been on camera while you did it.

So instead rig up a hair spray bottle on a collapsible pole and spray the lenses with hair spray. This has several positive features:

1. It blurs the image to uselessness.
2. It does NOT, however, blacken the image and is thus likely to go unnoticed for longer.
3. Hair spray washes off trivially, unlike spray paint, so if you do get caught it's at best a misdemeanour prank instead of felony damage of public facilities.

If you want to go the high tech route, rig a drone with a hair spray bottle and use it to spray it. But the key is to use hair spray. The goal is to render the cameras useless, not to damage them.