I care, but mostly about my country, then my continent, and only them I'm roughly aware of things happening in other large countries (Russia, China, the US). I still don't see why comment about the US administration is relevant here.
It isn't as if European countries are free of such problems, with similar minded parties, and since you mention Germany, AfD keeps increasing their size.
Because of the ways the benefactors want us to think it X
It really doesn't matter as much as the hysteria around it. Maybe the hysteria is 0.0001% accurate and that's generous. This is true for any political tribe, politics and political messaging in general.
The economic priorities of the US will have significant effects worldwide even if you put a watermelon in the president's office. It has been having significant effects worldwide for the last 100 years. Politics has not changed this one bit.