This. The 'race to the bottom', committed globally by central banks, to get to 0% interest rates, and keep them there for the sake of keeping the markets 'up', exacerbated by top level politicians' desires/directives.
If there's no cost to borrow, why not keep borrowing? And keep borrowing? And lending? Until things really unwind in a recession/depression that will de-lever everything/everyone.
The moral hazard? I try to maintain my own family finances, keep a budget, save for expensive things. And in the span of 3 weeks the US has spent $7,000 of every individual's future ($2T / 340M people).