San Francisco Chronicle, June 30, 2010 by Will Kane
http://www.sfgate.com/cgi-bin/article.cgi?f=/c/a/2010/06/30/MNM91E6R5R.DTL
“These celebrations become provocations. It is a way of saying to the opponents, ‘I dare you,'” said Frank Zimring, a professor at the Boalt Hall School of Law at UC Berkeley who studies gang violence. “It rubs the community’s nose in the vulnerability and the violence.”