The clerk applied the company anti-gun policy.
The officers didn't like it, didn't want to leave their guns in their cars like any other customer.
A stink was raised, letters were written, the manager apologized.
Applying it unfairly is even worse than having the policy in the first place.
(And maybe they didn't know BW3 was anti-rights... why would they want to give money to a company with such a policy?)