[AppyPappy]

Indeed they do, if they wish to rationally claim it as a moral imnperative for themselves.

No they don't. They can rationalize anything they wish. It's only YOUR morality that compels them to follow your rule. They can simply live by "Let the buyer beware".

[OWK]

People can "rationalize" damn near anything.

"Rationalization" is being used as equivalent to sophistry.

We're talking about objectively defensible and demonstrable reason, which is another thing altogether.

Reason demands that a moral code (a system defining good and evil among humankind) applies to all humans equally.

If it does not, then it fails the first test, and is hence irrational. (whether some clown "rationalizes" it, or not)

[freedomson]

In those days there was no king in Israel; everyone did what was right in his own eyes.

Judges 21:25