I disagree a little with @bluebell. I don't think it's not the "I'll kill you for your beliefs" it. It does play a part. But I don't think this would have had nearly the impact if it wasn't a) a larger figure within the MAGA movement who wasn't directly a politician and b) it was graphically video'd. Millions saw his death in detail and as much as we claim numbing to this....I don't think we really have. I haven't seen a single video of a child graphically being killed for any of the mass shootings that entailed children. Or basically any mass shooting, TBH. It makes it less visceral and more abstract emotionally. It's not right, but its human.
So, for example....plenty of black men had been wrongfully or questionably killed by the police. A number of those were captured on usually grainy video (which was already increasing awareness and social rumblings). None had the prolonged and dramatic filming that Floyd's had during a time where people were even more online than usual. It made the experience more real. Even if all of these are equally real in terms of weight and loss.
With luv,
BD