Yeah, so true. The impediment is, it’s political poison, the kind of problem that politicians absolutely don’t want to deal with - something that’s incredibly difficult and messy (completely reconstructing police departments and process by which police get hired), dirty (nasty fights with powerful police unions that may make them unelectable in the future) and then any fruits of their labor won’t be obvious until they’re out of office, so it doesn’t advance their political careers (or get people who want quick and easy solutions to vote for them).
So unfortunately politics as usual won’t get it done, even the purely political part. Sustained pressure by a committed movement (who make it political poison to not do the work of continually addressing the issues) and politicians that arise out of this movement are going to be necessary.