Are people really that stupid?

I am working in a shop this week. I have the shop to myself and I'm chilling out with some records on. During the day, the front door is kept locked and operates on a buzzer. The amount of people who push the door and walk away amazes me. Even if I wave, they just walk away. Sometimes, later in the day, people pull the door and think it is locked - and just walk away. They don't even bother to try and push it. The shop lights are on and there is music playing. The shop looks 'open'. Surely opening a door is a pretty basic cognitive function? How many options are there? Push or pull. Then, the variables - shop open, shop closed.

A friend works as a night porter in a guest house. He recently mentioned the lack of basic ability in many guests using the swipe card door locks. From his little office, he sees guests returning at 4am, swiping the outside door and just staring at the door. They don't even bother to push. Then they leave and probably sleep in a gutter on the streets of Liverpool with a broken bottle as a pillow.