This is sort of what I've been concerned about for a while; the growth in anti-police sentiment creates a reaction among the police that leads to more problems. With that said, being "wary of confronting suspects" would not be a characteristic form for that reaction to take.
Anti police sentiment is nothing new. It has a many decade history in Oakland. Barely any of their cops live there, and people really don't trust them. Compare to Richmond, CA which a few years ago decided to take a better approach to policing. Crime has dropped a lot there.
