You asked why you were downvoted. It's because of your arrogant attitude and trolling. But, I'll sometimes have some pity and feed the troll.
You asked why anyone outside the US should care what happens in the US. The answer is very simple. If the US experiences a collapse of some kind (which it might), it will have a profoundly negative effect on the value of currencies worldwide, including the EUR and GBP. So, no matter how much you hate it, the value of your currency is affected by the value of ours.
That's just one reason why you should care about the rise of conservatism and how it harms the U.S.