Because when there is no pilot, the airplane simply does not fly. Nobody dies, there is just an economic damage. But if there is no doctor, people still get ill

Because when there is no pilot, the airplane simply does not fly. Nobody dies, there is just an economic damage. But if there is no doctor, people still get ill, and then people die. Which makes it ethically easy to impose the one but not the other. And which is also the reason why pilots can go on strike, while the same is much more limited for any kind of (medical) care job.