they carved because most of those places want access to the 'yuuuge' US market.
politics vs reality. they could correct though by selling US treasuries - but that would make the world economy sneeze which might result in pneumonia.
US treasuries sound risky in a sense that if you accumulate them they become a crisis when you choose to sell.
The parent point is that the response should have been done collectively.
USA market is "yuuge", but rest-of-the-world market is much much bigger.