Since the last ties to the gold standard were broken in 1971, governments have expanded precipitously by way of deficit spending, into almost all facets of life.
If debt / cost of capital is > than income, the only way to pay it back is through more debt, or debt monetization -- hence the CB's. This ultimately creates massive fragilities
Debts are so large that the only way to prevent the system from exploding is by generating even more debt
And as a result, credit expansions have been getting larger, govt's have become more imposing and there's more tail risk than ever.