The reason why this is interesting isn't because humans are smart, but the assumption that human fallibility is both predictable and worth investigating (a supposition I'm inclined to agree with).

Even if humans are easy to fool (though the fact that we're just now achieving this on a generalized scale after at least 80 years of theorizing seems to contradict this), humans being fooled can result in significant enough impacts where we should still investigate the degree to which they can be tricked, and what methods of discerning are available to us.