They're just more visible.
Such as the Clintons.
The Kennedys are "rich trash"---take them out of the Hamptons and drop them in any trailer park in America, and they'd fit right in, character-wise.
My apologies to trailer owners everywhere, the majority of which are more moral and law-abiding.
This has the makings of a good tag line. "The Kennedy Curse: Bad things happen to bad people."