The police arent there to protect the public.  They are there to write reports afterward and deal with suspects later.  Anyone breaks into your home, it's your job to protect life and property of those inside.  
SB91 isn't to blame.  Petty criminals have always been treated as low priority.   High street drug prices and an addiction epoidemic are to blame and there really arent any law enforcement solutions.   The war on drugs creates the underground economy