But why wasn't last month the time for profound change, or the month before that or at the end of last winter when he was sworn into office? Or maybe, because it worked so well for de Blasio last fall, he has decided to be the change candidate all over again. And why did it take Eric Garner in a chokehold on the sidewalk in Staten Island for us to be told that better training was all we needed to turn everything around in the city, and also keep Garner alive?