Pearl harbour, Kennedy (both of 'em), Martin Luther King, The Unibomber, Marilyn Monroe, Elvis, ad nauseam...
Every time something happens that shocks the whole US there's a flood of pseudo facts hits the internet and the desks of ropey book publishers all over the world.
It's almost always an autonomic reaction initiated by the brains of the weak-minded to explain the unimaginable.
Happens here in the UK too...Princess Diana, Robert Maxwell, The Titanic...
Course I have to read all this stuff for myself, cos every now and then there's something in it (unlike the 7th floor window of the Dallas book depository that time...).