When a failure in the system happens, it needs to be magnified, studied, dissected, and the system must evolve to make sure it doesn't happen again. This is how we have safer nuclear plants, airplanes, etc. And in human systems too: coal miners and people on oil rigs have adopted new protocols to help their workers be more safe. The police is not immune. One act of brutality must be documented, post-mortemed, debugged, and mitigated.