When gang members shoot gang members, people often rationalize not getting involved out of fear for their own safety. From today's Times:

“You just keep to yourself,” said Shaunte Bellamy, who raised her children in the project, explaining that she concerns herself only with what happens inside her own apartment. “If it didn’t happen in 3C, it didn’t happen to me.”

But when a 7-year-old girl is the victim, silence equals cowardice, both for individuals and entire communities. As the saying goes, no justice: no peace.