The FED pours money in at the top, those closest to it prosper. Those farthest away become wage slaves. When that doesn't work well enough, they drop interest rates to zero. Not only does debt look like a liability but so does money. If the definition of an asset is something that produces income.
If you manage to save $100,000 with interest rates at zero and inflation at 2%. Your purchasing power decreases by $2,000 a year. It costs you $166 dollars a month to have that $100,000. They don't really want you to have any money.
Most Americans have their wealth wrapped up in their homes. The reason this usually (2008 housing crisis not counted), is that house values go up. Historically housing has risen at about 2% with inflation. Therefore, the creation of wealth is not due to housing values growing faster than other values in the economy. The reason mortgage debt was considered good is due to the Internal Rate of Return. For example:
If you bought a $100,000 home with $10,000 down and the house value rose at 2%. After a year the house is worth $102,000. Because you invested $10,000 and the asset value increased by $2,000 your internal rate of return (IRR) is 20%. The same applies to those who buy a business and sell it after 10 years. Debt can be okay, under the right conditions. Leverage... But then again, many of us got crushed in the 2008 housing crash.
PS. Not advocating home ownership. I want to sell my house and go RV full time - I think the IRR thing will go kaput again. Just pointing out that in this economy, virtue is vice and prudence is folly.