I don't fly very much. I have taken some of those tour flights to the Caribbean and have always felt the absolute peak of guilt, because there are no alternatives, so I either tell my wife we can't go, or I go and hold my nose.
It's true that they have this rule for some reason; they must make money by keeping the planes flying back and forth.
That's the only thing I can say. We don't take many, but when we do, we are conscious of it. I booked three of them because they landed before midnight.