If there was no security, you could walk into a movie theater with a prebuilt bomb and take out a room full of people. Or walk into a school, or walk into a mal

If there was no security, you could walk into a movie theater with a prebuilt bomb and take out a room full of people. Or walk into a school, or walk into a mall, or onto a train, or walk into... well you get the idea. We have a few people do that with weapons, but no prebuilt bombs. Yet I can still walk into a theater with no security, but not board a plane. You are more likely to die in a plane crash due to a maintenance issue than you are to a terrorist bomb.