Just read an article about pilots carrying guns on flights. Here's an excerpt:
"Not all pilots who want to carry guns will be able to. They have to volunteer for the program, {pass background checks and psychological tests} and make it through a week of rigorous drills."
You might think a person who is responsible for hundreds of people's safety, flying an aircraft capable of taking down a skyscraper could maybe squeak through a background and psychological test.
I think the world just got too complicated for me.