Originally Posted by
labbats
The same reason they don't save for retirement or eat so much they get fat.
They live in the moment and have no capacity for the big picture.
...or crowd around the gate 20 minutes before the inbound aircraft even arrives and then stand there like a bunch of gawkers while impeding the speedy exit of the folks getting off the very plane that they would like to board. Same applies for the trains at airports.
...or line up STRAIGHT OUT from the gate/McDonalds/Starbucks/etc. right into the flow of traffic through the terminal. Sometimes even blocking the exit from the moving walkways! Really? THAT'S the best plan we can come up with?!

(seems to be the worst in DTW).
...or stop and stare blankly at their boarding pass and/or cell phone DIRECTLY at the top/bottom of an escalator or beginning/end of a moving walkway.
The lack of self-awareness and fore-thought possessed by most of the travelling public is STAGGERING especially with regard to how their actions impact those around them in the crowded confines of aircraft and airports.