No rules exist, and examples are simply life-savers answering the appeals of rules making vain attempts to exist.
One of the depressing things one realizes as one gets older is how much of one's tastes and attitudes are simply products of economic circumstance at the time.
Enormous slaughter may have been acceptable in previous centuries. It simply isn't acceptable anymore.
In Haiti, beach bodies are simply bodies, and beach reads are simply books, because the beach is all around you.