When a second one crashed, the focus quickly shifted.
It is a common attitude in aviation that even pilot error is really a systems fault. Perhaps opposing buttons are too close together, or some control requires attention to be diverted at the wrong time, or pilots are allowed to fly too many hours without adequate rest, or plenty of other things that could contribute to predictable human failure.
It seems obvious that we can predict human failure in current policing. If two incidents with a 737 lead to an indefinite grounding, what's the right number for this situation?
In the case of the airplane, grounding does not create a public safety issue. And there are, of course, many alternatives that can keep the overall system up and running in the meantime. The solution to police brutality requires much more thought.
We cannot even get the police to agree that the deaths represent failures: they will usually dig up or even fabricate anything negative about the victim to imply that he or she deserved to die. You can see this happening in the comments here too.
It is not suprising that people want to ground the police.
Interestingly I was having a conversation about police before George Floyd. I had wondered whether policing should be one of those rotational civic duties. All able bodied people spend some time being a policeman. I think spending years only being called when things go bad makes police less sensitive.