> People decided this is acceptable.

I think this is fluid, and changing.

1) The Democrats of the last decades are just as much the friends of the rich and the corporations as the Republicans. So even if people in the US don't think this is acceptable, there was no meaningful (legal) political route out of it. Except...

2) I believe one of the factors behind the rise of (what is called) populism (both left- and right-wing) is the failure of the mainstream centerist political parties to align with the needs of the people (and especially the poorer side of society) rather than the rich and the corporations. They're presided over ever-growing financial inequality, coupled with ongoing inflation that far outstrips wage growth. The rise of AOC, the grass-roots support for Sanders, and even the rise of Trump (remember the points he campaigned on, rather than his actions when in power) are driven by this.

> CEO of UnitedHealthcare was shot dead...

As I've mentioned on here before, this was the first time I've seen the sparks of what might be a class consciousness in the US, as people who have lost out due to the awful healthcare situation (or have sympathy with those who have) found common ground, irrespective of their underlying political leanings. But it takes a lot more than one example to trigger a revolution.