Additionally, AI generated content, AI pictures and deepfakes have a numbing effect. I guess I can say "who cares?"
I would say it started before, when the supposedly most powerful country of the world was ruled by a senile person and it was not replaced immediately. Instead half the country negated the evidence that we now know was true.
I am not American so I observe those things with curiosity from outside and from inside only as a visitor.
But I don't know: the weapons of mass destruction, the too big to fail. Most people didn't care them unless it affected them personally, like savings.
My theory is the opposite, that people care too much. Company owners wanted free money so if the country gets destroyed in the process, they will "not care" as much for the people that printing money throws under the bus as the "care" about them and their personal proffit.
In a two-party system the same thing happens. They do "not care" about having a senile president as much as they "care" about not losing the power for "their" party. Now the same thing happens with Ukraine and Trump.
The culprit here is the two party system that lacks healthy competition for getting into power.