IIRC, high interest rates are caused by an economic boom, as raising interest rates is caused by both an increase in demand for cash flows to finance investments and also as a monetary policy to put economic pressure to control inflation.

Currently the world in general is very far from an economic boom, and central banks are actually implementing desperate monetary policies to jump start inflation. Thus, we are very far from those times to the point that nowadays a 3% interest rate is considered huge, as the norm is for interest rates to remain below the inflation rate

> Consumer savings accounts had absolutely nothing to do with the crisis.

That's just not true. A significant contributor to the mortgage crisis is that banks loan out savings that are backed by the government. Savers deposit their money with banks even if those banks are underwriting risky mortgages