I'm assuming they're genuine because you'd have to be a complete F'in IDIOT to run those things on national television two months before an election without authenticating them. And because the White House hasn't challenged their authenticity -- just like with the Swift Boat smears, they're more than happy to let others spread lies so they themselves won't have to. They'd look pretty damn stupid questioning the authenticity of the docs if they, um, turn out to be genuine, wouldn't they?
I'm also assuming they're genuine because the FACTS show it was ENTIRELY possible to create those documents in 1972, and because his superior has corroborated the content of those documents. The people crying forgery are the ones spreading lies -- that you couldn't do proportional spacing in 1972, that closed 4's didn't exist back then, that you couldn't do superscripts, that Times Roman is only available on computers. All lies, and demonstrably so.
But you think they're forgeries. Because of your agenda.
See the problem, pal?