Separation of morality and law is a recent trend. For most of human history, morality was the law. As such, it was a social contract born out of necessity and not some arbitrary installation.

It's fine to take a modern, legalistic, maximize-shareholder-value-or-gtfo approach and eschew the ethics and spirit of law perspective altogether. However, generally it would be irrational for corporation to expect a favourable outcome in a survivalist game on a legal field against the host government. That's why most corporations at least do lip service to ethics, community values, social responsibility and so on. Which leads us to square one.