Actually that's the whole point. The FA has to work. The TSA person has to work. The pilot has to work. They don't have a choice. There are people that do have a real need to travel and in order for that to happen all those people have to show up. In order to reduce their risk and allow needed travel to continue people who don't have a real need to fly need to stay home. That way those "essential employees" aren't exposed to as many people and are more likely to be able to continue showing up to work instead of spending their time in a hospital bed.

What it boils down to is whether someone is only concerned with their own risk or their impact on public health. This is a public health crisis and people focusing only on themselves instead of how their actions impact everyone else are just causing things to go on longer and be more shutdown than they would be otherwise. A lot more stores could remain open if people actually limited themselves to essential trips and wore masks when they did go out.