"Our boats are contractually required to be moored an hour before sunset."

If only I had a dollar for every boat that came in after dusk! I often sit on the patio counting them (passes for entertainment in the islands). Some of them are owned, not chartered, so they're not subject to the same requirements. But they have a much bigger incentive to be careful.

Attribute it to carelessness, stupidity, ignorance. Paid captains may also be to blame: I have come to believe their behavior is so motivated by tips that they will do almost anything.