Frankly, they ought to sue. Wal-Mart works when bureaucracies do not.
No one who is familiar with economic thought since the Second World War will be surprised at this. Scholars such as F. A. von Hayek, James Buchanan and Gordon Tullock have taught us that it is really nothing more than a terminological error to label governments “public” and corporations “private” when it is the latter that often have the strongest incentives to respond to social needs. A company that alienates a community will soon be forced to retreat from it, but the government is always there. Companies must, to survive, create economic value one way or another; government employees can increase their budgets and their personal power by destroying or wasting wealth, and most may do little else. Companies have price signals to guide their productive efforts; governments obfuscate those signals.
Government is always there. You may not like the clowns in office, and you can organize and vote them out. But then you have a new set of clowns in the same government positions with the same potential for abuse. And as rare as a kerosene cat in hell with gasoline drawers on that actually wants less power and wants to reduce the size of government with it.
But you organize against Wal-Mart they are either going to change or they are going to get out. They cannot live without people who are willing to deal with them. Try that with a politician, and they would thank Baal that you are leaving them alone to get on with their pilfering.