KMVY averages 141 operations per day, so the JFK, Jr. crash in 1999 has been followed by approximately 500,000 less eventful takeoffs and landings.
-- Philip
On one hand, Greenspun is a pretty noted Libertarian and not a fan of the Kennedys. On the other, he often references flying to Martha's Vineyard for day trips in his other writings about aviation, and it seems like a pretty sensible place to fly to if you're into civil aviation and looking for a day flight somewhere from Boston (where I believe he's based).
Nothing says it can't be both - it's a location that naturally comes to his mind, his point is valid (weather conditions can be dangerous there, Kennedys aside), and it happens to be a dig at some people he hates.
Packing that much into a short phrase is called good polemic writing, people.