Every few months, a new essay declares that the US debt trap has finally sprung. The latest one making the rounds from The Economist is well written and genuinely unsettling. It argues that Washington has borrowed so recklessly that the Federal Reserve no longer dares to raise interest rates. Doing so, the piece warns, would detonate the whole structure and send financing costs spiraling out of control. It’s a compelling story, great for clicks and views, and I’ve been reading versions of it since the 2011 credit downgrade. [...]