The US economy is inflated, but US treasuries are still in high demand and we might as well milk it for what its worth. The US is like the lannister’s of the world in that they’re rich because they always pay their debts (historically, their bonds have been the most stable.) Allowing, the economy to collapse basically denies us this otherwise free money and helps no one, besides those who fill the power vacuum, which could very well be big corporations.