Both of my parents were very punctual. My father, being a retired USMC Sgt. Major especially so. If Dad said we're leaving at 08:00, don't walk out the door at 08:01 and expect a ride because you'd be left behind. Likewise, don't walk out the door at 07:55 and expect to get in the car, because it won't be unlocked until 07:59.
Consequently, I view tardiness as inconsideration, incompetence or a combination thereof.