Zoning laws are the favored means of control of local tyrants everywhere. The watermelon greens (green on the outside, red on the inside) have seen them as a way to institute detailed control at the state and federal level that would never be tolerated locally.
This is what is going on with Agenda 21 and numerous referendums and legislative systems around the country. In Arizona we surrendered a significant amount of local control over zoning to the State for just these sort of rules. It is taking property without compensation.
The forbidding of significant walls around a property (3 foot tall fences in front, no more than 6 foot in the back and sides), is to insure that the enforcement agents can see what is in your property to enforce the zoning codes.
I think a great bumpersticker would be
SMASH THE WATERMELONS!
end environmental fascism!