Many are bitter, and believe the rules dont apply to them. Some would like to bring their political issues to work, and take it even further by racially profiling in the store, or selectively harassing the customers they choose to right at the door, or in the checkout line. Try asking them for help or directions though, and a natural look of cluelessness will settle like morning mist.
My opinion, which carries zero weight, ignorance, politics, remembering where we live, religion, and management being overburden by the total situation. These stores are so busy they are addressing only the extreme violations of protocol.
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