Poly,
My understanding is that law itself has no ethical or rational nature at all. This is not as bad as it sounds, however.
The problem is that we live in a society that is composed of people with radically different premises, and we are descended from a power system that viewed the mass of people as slaves of the King.
Law originated as the instructions of the King to his subjects. Morally speaking, the King’s authority derived directly from God, and his power was absolute. A wise king attended to the welfare of his subjects, but he was under no moral obligation to do so.
People, however, aren’t robots. Although morally the King’s power was absolute, it practice it was not. If the populace felt oppressed, they wouldn’t cooperate as efficiently, and the King might be deposed or the country invaded.
After a while, various laws intended to mollify the populace, as well as customary practices never specifically mandated by the King came to be regarded as fixed by tradition, and the King altered them at his own peril.
From around the time of the Magna Carta (1215) until the American Revolution, the moral situation became a little more complicated. The nobility, the middle class, and to some extent the peasantry conceived that they had rights of their own, which the King was bound to respect. But, on the whole the basis of law was the King’s God-given authority to use his subjects for his own benefit.
To its credit, the Royalty/Nobility/Commonality model proved itself tough and fit in the natural selection of human institutions, surviving millennia of conflict.
The US Constitution introduced a radical concept not seen since Ancient Greece: That the government derived not from God but from the natural rights of a free people. The people did not exist for the benefit of the government, rather the government existed for the benefit of the people.
Many of the compromises, and the limitations placed on the federal government in the Constitution derived, however, not from concern that the federal government might abridge the rights of the people, but from the concern that the federal government might abridge the rights of state governments. It was not until the 14th Amendment (1868) that the US Constitution was even held to restrict the powers of the State governments.
The Constitution notwithstanding, the tradition that the government held the duty and power to not only facilitate the social behavior but to direct such behavior persists to this day.
Thus there are two primary moral imperatives under which the law and its officers act: The duty to enable social behavior by providing a method for individuals to resolve disputes, and the power to direct social behavior for purposes presumably only visible to the elected elite.
It is interesting to note that legal philosophy itself notes that the laws of a particulat government do not constitute the highest legal authority. Under various precedent set by the post-WWII Nuremburg trials, it is unlawful for an individual to follow the laws of his government when those laws compel him to perform actions which constitute “crimes against humanity.”
Thoreau and Ghandi have demonstrated very persuasively that it is a moral action to refuse to comply (under certain limitations) with an unjust law.
One can of course, in the United States at least, petition and speak out to change or repeal an existing law without that action in and of itself being considered immoral.
Thus I come around to my original assertion: Laws themselves have no intrinsic ethical or moral value. At best, they are expressions of underlying moral values. Often, they are merely compromises for people to resolve disputes in a consistent manner. Sometimes they are expressions of the governments power to direct society, for good or for ill.
You break at a law, naturally, at your own peril. People do actually get arrested, tried, and imprisoned for doing so. However, breaking a law in and of itself does not necessarily imply you are acting immorally or unethical; in fact, in some cases, the only moral action is to break the law.