ELI5: Why?
The owners of capital look out for themselves. Seriously, there is more class consciousness among the obscenely wealthy, than there is among the plebes.
Financial bail outs are one thing, but corporate lawbreaking is treated different by the courts, however, I think things are starting to change. Elon is going to cause a shift change and corporate America is a little worried.
Suppose there was death penalty for this type of behaviour. If you default of $100M of debt you are executed, no limited liability shroud, no bankruptcy, no backsies, no do-overs -- just cold steel. Your head in a bucket, and your family destitute in the streets.
This type of behaviour would cease to exist almost immediately.
A bit of this is like things being described in unlike manner, a bit is fundamentally different situations (needs and relative scale.) A person needs at least one home, and rarely has more than one. If they shed one because they can't afford the mortgage—whether or not that is a good financial decision—they still need a new one.
A commercial landlord that sheds their Nth property still has N-1, and can continue working as a commercial landlord without a problem.
Also, a homeowner that does a deed in lieu, short sale, been foreclosed on, etc., on a home loan has probably had forgiven or defaulted on a lot greater share of either their income/revenue or total debt than a commercial landlord that sheds the Nth property for similar reasons.
But generally, not dragging out an unmanageable loan and cutting the bleeding via short sale or deed in lieu where practical is considered prudent for individual borrowers with home loans.
Does it hurt your credit? Sure. But that's a temporary thing, and wirth shedding the drag on your finances for in many cases.
The bank takes the knock,carries on as if it's business as usual in an effort to prop up their own revenue.
Too big to fail I guess.
The bank also has rights on the property after it goes into default. They don't lose all their money.
Homeowners who stop paying mortgages do not have access to cash, so there is no utility in doing business with them.