Nick Heer (via Michael Tsai):

[U]sers should have always been viewing search results with much more scrutiny than they do. But many people are lulled into believing that Google’s representation of the truth is the correct one. Their rich snippet answer box made this already-pervasive belief far worse by highlighting a single piece of a webpage as, seemingly, The Answer, even for questions where The Answer doesn’t exist. That’s a deliberate design decision on Google’s part, and one that should be reversed.