One of the best things that New York City did while I was living there was to get rid of qualified immunity for police officers. Those who enforce the law should be the last people who should ever be considered to be ABOVE the law.
Simply resigning from one’s position should never absolve one from a crime nor be means from escape from investigation into/prosecution for one’s commission of/participation in a crime/crimes. And for police officers, specifically, when resigning from one police department, it should preclude the ability to ever join another.
Those who are entrusted to enforce the law should be held to a higher standard, not a lower one. This is one of the greatest civil failures of American society that must be corrected as soon as possible.