The problem is this whole qualified immunity is a civil thing. Workplace safety negligence, theft, police violence all are criminal cases. But. After the the prosecutors (DAs) stopped charging police officers people started suing them in civil court.
The problem is not QI per se, the problem is _wtf_ is going on with cops killing anybody in non-violent cases. (And how come there's not a public inquiry when someone dies in law enforcement custody or during any interaction with police. And how come nothing has really changed over the years - except police got the old tanks from the post-9/11 war-on-terror spending spree.)