The whole notion of the police "manhunt" is not a new American phenomenon. Cops chase bad guys, cops corner bad guys. Sometimes the bad guys give up quietly, sometimes they go down in a blaze of glory. But we've always had rules of engagement when it came to law enforcement interaction with the general public. It appears all that got thrown out the window in the aftermath of the Boston Marathon terror bombing and the subsequent police chase in Cambridge, Massachusetts that came to a screeching halt in Watertown. Seemingly, for the first time in the United States, we witnessed...