I suppose shrimp and pork and beef are also unquestionably evil... Debt didn't historically work because property rights were poorly recorded. This meant enforcing one's debt involved mafia tactics. Modern debt is cleaner and subject to bankruptcy, a process that occurs on a case-by-case basis when it's needed, a far better solution than randomly cancelling debt every so many years.
For example, businesses often need to borrow money in order to get started.
For another, "bridge" loans and "revolving lines of credit" allow a business to operate when the timing of receiving payments does not line up with the timing of when bills are due.
Forgiving debts means that interest rates must rise to cover those losses.
The figures mentioned use full salary, in reality you might get some 50% of that possible to allocate to paying off the debt. You still get to pay utilities, cost of life for the family, transportation, education and probably extras. Note I've even ignored any savings - and with high mortgage debt, you can be wiped out by any more expensive health problem.
Interest based credit is important for capitalism (use money to make more money), but certainly not for market economies (Use money as a tool to exchange goods you want/need). Both are distinct and can exist independently.
In the end it was basically just a workaround that was effectively the same as charging interest and that same Muslim family ended up taking a conventional loan when they moved instead of an "Islamic-compliant" mortgage because it was a lot easier.
[1] http://www.npr.org/sections/money/2016/05/13/477956675/episo...
Most people have negative savings every year. They have more debt. If one has bought a house, then it is very easy to go into more debt every year, when house prices are rising. Then they fall.
Since the beginning of written history (the first written records are records of debts) there are stories and parables about the evil of debt and the need for debt jubilees. Also the idea that lending with interest is immoral is found through out time. Having such easy access to debt/credit from strangers seems not to work well over the long term for human societies.
I mean, is it a good thing that one can get a "Rocket Mortgage" where you can "Get Approved Fast. Get an approval to buy a home or refinance your mortgage in minutes."? [1]
[1] https://rocket.quickenloans.com/