Colbert on Huffington Post: stumped by Stuxnet

The story is rather trivial, and Colbert injected a good dose of humor in his confession. He generally knows to laugh at himself, unlike many other pundits.

The attitude of the public, though, is more of a mystery. Why shouldn't Colbert be stumped where experts certainly are? Why do we expect from our famous talking heads to be universally educated in everything that happens to be delivered on their studio tables?

Of course, there is another, more loaded question: why do some talking heads consider themselves (unlike Colbert) to be qualified  to broadcast their opinion on every such subject, when it's clear they don't have a slightest idea about it?