I hate to admit that I find it kind of funny, too....
We deal with that all the time - projects get denied outdoor lighting by the US Fish and Wildlife Service because of these same fears. I'm shepherding a road project through the Endangered Species Act consultation project right now (a road project designed to reduce sedimentation and improve water quality for the turtles and their friends, incidentally), and the first word out of our moths was "we're not putting in lights!". You know, just to get that off the table.
But the real sad thing is, that couple will probably get freakin' nailed to the wall by the USFWS in federal court. Those guys can be nasty...