Many things that are currently crimes need to not be, and many other crimes need their mandatory sentencing reduced/eliminated, or need to be downgraded from felonious transgressions to mere misdemeanor / citable offenses. Police-force culture is a big problem, but it's respondent to and reflective of a larger culture that—for moral, but even more so monetary causes—stresses carceral options over community censure and individual rehabilitation.
Much needs to be done, but one step I'd like to see is discouraging recidivism by making it more difficult for employers to discriminate against individuals previously convicted of a crime. Obviously there would be some exceptions—for instance, perhaps a minimum amount of time out of the criminal-justice system, and otherwise employed, before one can work with children—but I think making sure our ex-convicts truly are ex- (as opposed to ensuring they are once-and-future-convicts) would go a long way in discouraging police forces from conceiving of large groups, and even whole communities, as essentially separate from society and criminal-by-default.