The relatively generous treatment of debtors in the US seems to illustrate, at the national level, a pattern found among US states. Pro-debtor institutions are, in political terms, a substitute for redistributive taxation.
Where credit is easy, and the consequences of non-repayment are not too drastic, households can maintain consumption for long periods even when their income is falling. So, the political resistance to pro-rich policies is much less sharp. The massive increase in income inequality in the US since 1970 has coincided with an equally massive boom in consumer credit.
The obvious question is whether this political equilibrium can survive. We’ve already seen a tightening of bankruptcy laws in the US and a big shift away from fixed-rate loans. Almost certainly, in the wake of the current debacle, lenders will act to protect themselves from jingle mail by lending lower proportions of house value and demanding additional security.