If it helps us evaluate the quality of information we're getting from our electric teevee sets about whodunit in Boston, we might consider this:
For a few days, the prosecutor shootings in Kaufman County, Texas, commanded the air waves. Virtually every on-air performer conveyed the notion that our culprit was a cabal of racist, ex-con, anti-government, gun-clinging skinheads.
Upon further review, authorities and the media now suggest that the prime suspect is a fat, middle-age, former government employee with hair, a law degree, and a conviction for stealing government computers.
So no matter who Rachel Maddow decides to blame for the Boston bombs during any given on-camera take, we might want to reserve judgement.