Generally speaking, when TV turns its hungry eye onto real people, the result is exploitive, mocking, or as fake as the plump lips on "The Real Housewives of Orange County." No matter how waggishly funny the "Daily Show" correspondents are, or how noble Diane Sawyer may think she is, or how yellow Nancy Grace can't help but be, the human beings they interview wind up as driven prey.
The TV adaptation of "This American Life" really tries not to pounce on its subjects. Like the public-radio show on which it's based, the new Showtime series projects respect for the "ordinary" people it delivers for our entertainment. The goal is to dig up human curios of Americana and bring them to light gently and affectionately -- a kind of nonfiction variant of series such as "Northern Exposure." "This American Life," tonight at 10:30, is as sincere as everything on Comedy Central or "The Surreal Life" isn't -- which stands as a warning to viewers who require ironic inversion in their diversion.