Each case has to be evaluated on its individual facts, so I'm not going to speculate on other hypotheticals. That crap can go on forever. But let's look at this case ok? Tell me how the police are being treated here.
With regards to the justice system they are being treated better than non-police would be under the same situation. They were not arrested and charged instantly, etc.; there was no crowing DA all over the media the next day touting how these dangerous men exceeded the law and are now facing charges, etc. - this took days and weeks to get to the point where these guys got booked.
I don’t see why police should be treated any differently. Any time someone dies in custody or through a shooting, the officers responsible should have to go through the same justice system the rest of us do if we shoot someone breaking into or invading our homes. Condemned or exonerated by jury.