When people visit this area (or any resort area for that matter) they somehow feel some bizarre sense of entitlement. They think they can do what they want, when they want, without any modicum of guilt, remorse or any other typical human emotion.
"Hey, I'm paying $2,500 for a week down here. If I want to dig holes in the beach, throw a bucket of chum in the surf, ride my scooter in the middle fo 30-A doing four miles an hour, ruin others meals with my monstrous children, etc. then that is what I'm going to do." And all this will continue until someone threatens to whip Daddy Don't-give-a-damn's butt.
Next time I'm down, I'm going keep an eye out for the hole-diggers. If it's not filled in at the end of the day, the parent responsible will either be filling it in themselves the next day or I'll find another use for their shovel.