People with a brain know that passing contact with someone in a shop is unlikely to give them COVID. They also know that hanging around in a snake queue for 40 minutes to check in, hanging around in a snake queue at security, hanging around at a gate for an hour, then sitting like a sardine in an air conditioned tube for four hours may well, whether people are wearing (non surgical) masks or not. From my experience of LHR the airline industry (both on the ground and in the air) is self harming: they are simply not taking their responsibilities seriously or taking obvious steps to keep people safe.