Why Isn't This Obvious

People are complaining that airlines are filling airplanes too full, crowding passengers too close together. Are they doing so at the point of a gun? Why are the people who are complaining about it simply not getting on the airplane, or getting off once it becomes crowded? "I'm not sitting here," addressed to a flight crew member solves the problem. But no, the airline is blamed.

We're not sure that having Covid19 and recovering from it confers immunity? Really? How can one recover from a viral illness without developing immunity? If you don't develop immunity, you remain sick.