I disagree with a number of you, but I won't do quotes because I don't want this to be personal.
For starters, I know that the problem in Minneapolis, as it is in many places in the U.S., is systematic. That means that the system governing police officers is causing situations where police officers are killing innocent citizens.
Take this particular case. One might argue that there is a single bad apple or two, but four? And they all happened to be at the same place at the same time? That would be some awfully bad luck.
What is more likely is that not only had the officers been taught that what they did is ok, but it is also likely that they were trained to do it. Such callous behavior has to be taught.
Police officers are taught an us vs. them mentality. They are literally taught to call us civilians as if they were an occupying military force. Think about it - we aren't citizens, we are civilians. This is why the police officers did not listen to their fellow citizens because the police officers do not consider them as such. If one really wants this to stop, the whole mindset of training a police officer has to change.
I believe the man's death was tragic and possibly avoidable. However, I don't believe that the officers were evil. I just don't see the possibility of 4 evil police officers in the same place at the same time. And remember, they knew that they were being recorded. They thought that they were doing the right thing. That automatically means that Federal charges don't apply.
For state charges, one has involuntary manslaughter, at best. The police were the ones who called the ambulance. My thought is that Mr. Floyd was suffering from a combination of bad health and bad drugs. I believe his resisting of officers was instinctive due to his poor health condition. I think the nose bleed was cause by brain trauma caused by wither the neck hold or his health condition. I do not believe that the police thought that the man would die or that they were causing his death. And at the moment, we don't know if they caused his death.