Missiles don’t shoot down airliners. People do. But determining whose finger pushed the button that sent a guided rocket into MH17 is a lot tougher than determining that it was a missile that brought the Boeing 777 down, killing all 298 aboard. MoreMH17 Ukraine Crash: Russian Roulette RevisitedMalaysia Airlines Ukraine Crash: A Working Theory of the Shootdown'No Perry Mason Moment': U.S.