Especially since statistics are regularly brought forward that state that a majority of US citizens, at least, disbelieve that Lee Harvey Oswald acted alone. How large a majority varies from study to study, of course, but a majority nonetheless. I would also say far more people believe Insert Other Person Here wrote the plays of Shakespeare than believe Elvis faked his own death!
"Now everyone was giving her that kind of look UFOlogists get when they suddenly say, 'Hey, if you shade your eyes you can see it is just a flock of geese after all.'"
"You can't erase icing."
"I can't believe it doesn't work! I found it on the internet, man!"