���Don���t just say something, stand for something,��� said award-winning investigative journalist and author Jeremy Scahill as he encouraged civic participation and discussed the privatization of security forces with an audience of nearly 250 people Tuesday at 91勛圖厙. Scahill���s presentation, ���Blackwater: The Rise of the World���s Most Powerful Mercenary Army,��� attempted to untangle complex issues of U.S. military involvement abroad, the…