Now, I'm going to make a final point in this post which is what happens when we compare these police killings to airline accidents. Imagine if there was a large group of psychos who, after every airline crash where no one was really found to be at fault and preventable deaths happened because of bad systems, would claim that pilots, ground crew, ground controllers, whomever, acted reasonably under the circumstances, and plus the passengers were probably not innocent and they chose to fly on the airplane and they knew the risks, so we really don't need to change anything, let's move along, nothing to see here. I don't think it'd take too long before no one would fly anymore.
Treating police deaths the way we treat airline accidents (and here is where I admit I sort of stole this idea from a conversation with my mom) is actually of greater moral urgency because while you could choose not to fly, you can't choose not to be policed. Bad systems lead to death, spare no expense to change system in a way that will not result in future deaths. It's really not rocket science, as long as you're not ingrained in the idea that some people's lives....don't, uh...matter
And, finally finally, the above of course applies to situations where the police don't just sadistically murder people for basically no reason.