Those private islands with megayacht (nothing under 100’) marinas and private jet runways are guarded by private security companies like Blackwater, with the latest gear such as FLIR surveillance etc. Make sure you pack a lunch.
Plus, if anything nasty threatened one private island, they would merely fly the coop to another of their dozen ranches, mansions etc around the world.
I am aware that not only do they have good security, it will increase as things go down hill. The problem they must face is that their security forces, pilots, drivers, servants, all must come from the very people they have oppressed. A hand full of heavily armed and militarily trained men could easily capture, let’s say, a Senator or close relative thereof. From that asset, more contacts can be gained via their personal Blackberries, PDA’s, laptops and cell phones. They will be persuaded to give up the passwords. Then intel on whereabouts would increase exponentially.
Another point would be, if lock and load time comes, we would no longer be limited to owning arms acceptable for “sporting purposes” A fifty cal or morter can do a number on a 100’ yacht from quite a distance. I can fly planes as well.