We have the same DA-refuses-to-prosecute issue here in Madison, WI - except the issue is car theft by teens. The DA is an elected position. Our chief of police resigned last year because the police would arrest them and they'd be let out hours later on a signature bond. There are kids who have gotten arrested more than 10 times for the same thing - stealing cars and shoplifting - but either the DA is afraid of appearing racist or his office is so overworked it's impossible to be effective.
Society is running on auto-pilot with no enforcement of everyday laws, and sooner or later things are going to break down in a big way.