If you are stupid enough to borrow more then you can comfortably pay back? Then you are the one at fault. Even a six year old can understand that you can not pay someone two dollars if you only have one.
The bank can foreclose and sell the house. If you are older then six then do you really feel that you need someone to hold your hand all the time?
The big difference is between a Broker and a Fiduciary. The Broker is a salesperson who wins when s/he makes a sale, even if the product purchased by the buyer is likely not to his or her benefit.
The bank is the broker, and they will make a loan without full disclosure to the buyer. A fiduciary would not omit telling the buyer that real estate is not a sure thing, and the balloon payment due in 5 years might not be able to be payed off if the home has gone underwater.
The bank then will bundle all the likely failures to payoff the balloon payment and sell them, they they profit twice, and screw both the buyer and those who bought the bundle.
Everyone who has purchased a home, and signed the loan papers signs a large number of documents with large amount of fine print, and is rushed to sign them even when they are not sure; and trust the loan officer who is a broker, not a fiduciary.