[jammer]

Well sure, it's a fundamental principle of human nature that EVERYBODY will act in their own self-interest. Nothing wrong with that, it's simply the way life is.

No, there IS something wrong with that and that's not the way EVERYBODY acts. That's the way lower animals act, or others without ethics or morals. But many people eschew their own self-interest in the interest of ethics and/or morals.

[blackdog]

A self interest bump! I thought he should have stopped digging, however noble the hole was becoming.

[Willie Green]

But many people eschew their own self-interest in the interest of ethics and/or morals.

I'd say many people decide that moral/ethical behavior is best for their own self-interest.