Broken windows policing doesn't directly address crime rates, it artificially inflates the levels of perceived crime in order to boost police reputation through reported statistics.
Real crime rates have been falling ever since they started measuring it, and there is no demonstrable correlation with increased police presence or strength/brutality of their weapons.
I lived in SF proper for many years. The lack of prosecution for smash & grabs absolutely led to an increase of more smash & grabs. Here's an article Google found for me easily: https://sfist.com/2017/08/31/massive_jump_in_san_francisco_c... (and don't skip the comments) - people simply stopped reporting smash & grab because they knew it was useless.
