I don't view keeping your word or not cheating against a unilateral agreement as a virtue.
Doing the moral thing in many of those situations requires going against the laws or rules of those unjust systems. In other words, it requires cheating for the purpose of changing the system.
Civil rights disobedience, Gandhi's fight for independence in India, fighting against monopolies, and unionizing all require rejecting others' rules or laws which you feel are immoral.
Sir, you appear to be arguing with the Arch-Boomer. The rules were written (and re-written, and re-re-written) for him for the better part of a century - do you think he's open to any other way?
If you develop a reputation for integrity and honor, things will stack in your favor.
If you go around telling people that it's fine to steal from them, do you think they'll consider doing business with you? I wouldn't.
I had a conversation once with the contractor who was fixing my roof. He said that he'd have a customer now and then who didn't pay. He said the roofing contractors all knew each other, and they kept a list of those customers and would refuse to bid on jobs for them.
Doing the moral thing in many of those situations requires going against the laws or rules of those unjust systems. In other words, it requires cheating for the purpose of changing the system.
Civil rights disobedience, Gandhi's fight for independence in India, fighting against monopolies, and unionizing all require rejecting others' rules or laws which you feel are immoral.