@Putin,
CA has argued well, and I don't differ from his points.
"And do you also claim that compromise is possible with moral absolutism? Or moral learning?"
I think moral "learning" is incoherent *without* moral absolutism. Without absolute morals, we wouldn't be learning -- just changing our arbitrary moral rules.
"I assent to abide by the law and view the law as legitimate."
As CA pointed out, there is a difference between legitimate and morally right. If there were not, then by your own admission here, you would be actively working for immoral ends whenever you opposed the status quo.
"... and I accept that opposing majorities have the right to implement laws and minorities must accept them."
As do I.
"So your system of morality permits doing nothing in the face of moral evil and permits allowing evil to prevail? "
CA more or less answered this, but I would add that it depends on the type and degree of the evil. If the government merely allows something evil -- such as euthenasia -- that does not actively oppress and destroy people against their will, then I would fight it politically, but would still honor it as a legitimate law, while working for that change.
On the other hand, laws that completely abdicated a government's right to protect its citizens from others, such as those enabling slavery or (in extreme cases) ethnic cleansing, I would feel completely free to subvert in any way I could. So I do not, for example, judge those who ran the underground railroad; indeed, I applaud them.
"Nor do I see how compromise, which is essential to democracy, is possible."
Compromise is possible if it creates a move in the right direction. As CA said, any political stance which assumes that perfection will be attainable in this world is deeply out of touch with reality.
"The question is does Semck believe an immoral law can none the less be legitimate if implemented in a legally permissible way?"
It can be legitimate without being moral, provided that it does not unjustly oppress.
Incidentally, even with a belief in absolute morality, there can be valid differences of opinion on wise laws. For example, adultery is absolutely wrong; and so one might naively think that it should be illegal. However, banning it creates significant problems of its own, due to the limitations of humans, and history and reason strongly suggest at this point that it should not be criminal, even though it is wrong.
"If moral laws are fixed why subject the law to the changing whims of the majority?"
Because there has never been a perfect governor, and because the situations in which morality applies even as morality remains fixed. Enslaving and sexually dominating another human being has always been a terrible sin; but online trafficking in child pornography is a novel expression of it, and requires new laws (such as the PROTECT act).
"I do not understand where moral absolutists come to believe that democracy is the best facilitator for producing a society governed by moral laws, based on their starting point. "
Because humans of necessity must make the laws, and humans are profoundly flawed. I could say, "Hey, guys, I am a reasonable moral absolutist who wants only the best. Trust me with absolute power, and you will get laws that enshrine perfect morality for all time."
But there would be some problems with this. First, while I believe in absolute morality, it doesn't follow that I think specific humans have perfect moral vision. Second, and worse, I'm a corrupt and fallen human, and power would badly corrupt and tempt me. While I hope that it wouldn't do so badly, it's hard to guarantee, and it would almost certainly do it some. There is no question that the laws I would create would be, in some respects, unjust.
There are a lot of arguments for democracy.
A government has power over the lives and rights of all its citizens, and democracy recognizes that no human is morally good enough or wise enough to do this better without than with the consent and participation of the individuals subject to the laws. A law that unjustly oppresses a minority will never be right (and thus I laud the antimajoritarianism of the Bill of Rights, for example); but in a democracy, at least the people have the putative ability to prevent laws that oppress a majority.
The Declaration of Independence nicely sums up how I feel about the relationship between absolute morality and governmental legitimacy. It's of course a well known passage, but I'll quote anyway.
"We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable rights, that among these are life, liberty and the pursuit of happiness. That to secure these rights, governments are instituted among men, deriving their just powers from the consent of the governed. That whenever any form of government becomes destructive to these ends, it is the right of the people to alter or to abolish it, and to institute new government, laying its foundation on such principles and organizing its powers in such form, as to them shall seem most likely to effect their safety and happiness. Prudence, indeed, will dictate that governments long established should not be changed for light and transient causes; and accordingly all experience hath shown that mankind are more disposed to suffer, while evils are sufferable, than to right themselves by abolishing the forms to which they are accustomed. But when a long train of abuses and usurpations, pursuing invariably the same object evinces a design to reduce them under absolute despotism, it is their right, it is their duty, to throw off such government, and to provide new guards for their future security."