As an SF resident, I am sooo sorry about what happened to the Yale Choir. THe police handling of the case, well, is questionable at best.
As a parent who knows students at both the HS involved, who had a child a few blocks away waiting for me to pick her up, and who has a relative living 3 block away from the ambush, I am horrified at what happened.
Many San Franciscans' are disgusted by the attack and the handling of it afterwards.
Do not worry, the pressure is on here in San Francisco, and the residents will not rest until justice is done.