I recommend the communities that are victimized by Guerrilla Art to rally...in Roman styled battle gear no less. Meet this barbaric art at the gates and destroy it by fire and sledge hammer. And with great ceremony extinguish the flames of jealousy via portable fire extinguishers. Afterwards, the gated-community crowd can use the broken remains of their arch enemies' war equipment as fuel for a bar-b-que. Vandalism, arson, operating an incinerator without a permit, and and air quality violation. 25 years and a $50,000 fine, minimum.
How dare these people choose to construct a defensive perimeter! What's a garage door without tags and graffiti?
Maybe using the open flame of fire is going a bit overboard...so power saws (electrical or pneumatic if necessary) will replace the touch!