In my mother’s case, there was some narcissism, and some OCD, believe it or not. She couldn’t leave anything at the house undone, so we might be late because she had to load the dishwasher, straighten up the family room, take the dog out (even if we wouldn’t be gone long).
It wasn’t that she thought people would wait for her-- it was that she thought being late was her own business. If she missed something, she missed it. That people might have waited a bit, or her coming in late might have been disruptive never crossed her mind.
Some school systems will no longer dismiss a child on their own until high school. My son’s didn’t. He could have walked home from his elementary school, and he wanted to ride his bike, but he wouldn’t be dismissed to do that. He would only be dismissed to his bus, or an authorized pick-up, which was me, his father, or someone his father or I had authorized by filling out and signing a form, and the person’s ID was checked and photocopied.
I started biking in with him, biking home alone, biking back to the school, then home with him. He was 8, and it was his first experience on the city streets, so it was just as well. But he was a big kid with a 24" bike, that I put an orange flag on anyway, and got him a brand new helmet, and put a loud bell and a small rearview mirror on his handlebars, so he could see me if he were in front (I got one too).
We did it every nice day from 3rd to 6th grade, then middle school was much farther away. The elementary school was 5 blocks, but if he walked, he would have to cross one 4-lane street that was very busy, and did not have a crossing guard.
I apparently inconvenienced the “carpool,” which is what a long line of parents waiting to pick up kids is now called, by pulling up to the door on the sidewalk on my bike as soon as pick up started, and not getting in the carpool with my bike-- I was not going to breathe exhaust for 20 minutes for protocol, and there was no walk/bike line. There was a woman who lived across the street from the school, and also came directly to the door.
I think the benefit trade off to me and the boychik was worth inconveniencing carpool. Besides, I always got there just as they opened, and they had him ready to go, first in line.
If I showed up variously, sometimes early, sometimes late, sometimes in the middle, I think they be justified in being grumpy, but I did my best, and the regular teachers, were actually quite nice about it. Any time it was someone different, I got a lecture on “Everyone else uses a car.” One teacher even asked me if I’d lost my license (meaning, had it revoked), or couldn’t get one.
Some people perceive just being different as inconvenient.