“Either they kill us or we kill them” reads the headline on the first page of the May 4 New York Times quoting a member of a violent gang in Honduras.It echoed in spirit, if not in exact words, how in New York City circa 1957, the leader of a Puerto Rican gang known as the Sharks described its clash of mutual hatred with the Irish, Polish and Italian Jets in the classic “West Side Story.”The Lyric …