@Warrior. "While this event is tragic and the police officer was in the wrong, why does this have ANY impact on anyone outside of the man's family?"
Because the system (initially or entirely) doesn't recognize that the officer was in the wrong and doesn't deliver an appropriate punishment for their wrongs, and because of that, the officer could keep his badge (or have no problem obtaining another), continue the brutality to other people, and get off with little repercussions. You'll have no idea if the next cop you interact with will be the next Derek Chauvin.
In fact, this was not Derek's first foul play: pbs.twimg.com
Sources that support:
mercurynews.com
washingtonpost.com
latimes.com
People care because the silence and the "at least it's not me" outlooks combined with the ridiculous criminal justice system has convinced these 'bad apples' that they'll have no consequences to worry about when they go too far on their next victim (who may or may not be you or someone you care for). And people get fed up when the warnings they've been giving about these officers for the longest time go ignored and nothing changes. When ignored, the brutality goes on, and the protestors greatly increase their measures to be "heard".
If you want to put yourself in George's family's place and simply reject any sympathy or help from the mass of witnesses because you believe you can argue against the system all by yourself and deal with the mental and financial costs of pain/suffering from the completely avoidable loss of your family by yourself, the outreach and the message that "the police officer was in the wrong" will be NOWHERE near as big.