FF.
The vast majority of police officers are good people, yet there are too many regressive leftists who want to argue otherwise. There are some police departments that are bad (Baltimore and Ferguson come to mind), but they can (and will) be made good with proper reform. Even so, Charlottesville is not anything like Baltimore in this sense.
For me, I think the left-wing position is to be in favor of increasing policeman salaries (as they are workers in their own sense), while also enacting policies such as required body camera usage for dangerous operations and accurate vetting that eliminates the ~5% of officers that are bad people.
This plus better training. Currently, police training mostly revolves around how to use their guns and other weapons, rather than on de-escalation tactics. It would also be helpful to expand bias reduction training, so that (for example) police don't immediately escalate to violent tactics when they see a black man in the heat of the moment.
Programs that improve communication and general relations between police and their communities are also important.
The part about accurate vetting cannot be emphasized enough either, with all the documented cases of literal KKK members joining police departments and all that.