Conceptual issue - NOT THE BOAT - The defense project
In one of the very first scenes, they discuss "The Sicilian Project". Essentially, they want to use lasers which are activated and linked up from 'ground to infinity', setting up a 'shield' around the United States that no missile could penetrate.
Ok - well, since missiles were (and still are to my knowledge) propelled by fuel engines, exactly how would this dumb shield work? If it's going to knock down all missiles, wouldn't it knock down all jet planes too? And since 100's (if not 1000's) of planes are flying each day across this 'shield', I'm really glad to know that these idiots came up with a plan that would virtually cut us off from the rest of the planet. That is, of course, unless they expect to build a lot more steam liners like the Titanic and ship everything and everyone by boat. Maybe that's another reason to raise the Titanic. They'll need all the ships they can muster.
Seriously, I know it's 'fiction', but good fiction takes leaps above, but doesn't leave out, all common sense.