I don't understand why it's scary. That's human arrogance IMO. The earth is much bigger than us
Its a trust thing. Nothing to do with the earth.
You get in the car, you drive your car to work, you get out, rinse, repeat for 20 years. You and your mates at work do it, who are all driving the same car.
Then one day your car blows up and you're killed.
Every one of your mates will question getting into the car.
The fear is due to something you trust sending you inexplicably to death. You don't expect the car to blow up, just like you don't expect the plane to disappear without a trace. Both betray the human trust placed in them.
To ignore the fear is actually less human. Writing it off as 'she'll be right' is ignoring your own mortality.