From a sort of naive perspective it doesn't matter whether it's police or not. If you kill someone illegally, you should be held accountable for it. In many cases, whether it's illegal depends on how reasonable it was to do so. This is where it being law enforcement starts to matter even more.

Law enforcement face a lot of violent resistance, so it can be very reasonable for them to see an uncooperative person as a serious threat to their life. If they kill someone, because they believe them to be a lethal threat even if that was not the reality, their perspective absolutely matters to the outcome.

Civil disobedience is basically understood to be breaking the law in a civil manner. What I'm seeing in a lot of videos is not civil disobedience. One expected attribute of civil disobedience is non-evasion, but resisting arrest is essentially attempted evasion.

https://plato.stanford.edu/entries/civil-disobedience/

Again, I don't think anyone should have died, but to my eye I can tell the people who are unreasonable and lacking in critical thinking, because they have already prejudged and sentenced people as if they've already sat through the entire court case and had their own hands on the gavel as it went down.

Social media, videos, news, activists and more are incentivized to rile people up. Let it be investigated.