Ethics, honor, promise … being a man of your word … all that applies only to non-collateralized, verbal interactions between human beings.

There’s no ethics and there’s no honor in legal contracts. It’s all based on cold logic. Especially true when the other party is not a human being but a soulless machine. The contract states that the bank will do A, and you will do B monthly for thirty years, and, should you fail to do so at some point before those thirty years are over, the bank is permitted to do C. In the event of a mutual agreement, both parties may discard the contract and sign a new one under different terms. Ethics does not enter.