Ah, yes. Enforcing the law. That sounds rational. But not all laws are good. Some are downright destructive. You might wonder why I say that, but instead of raving on, I'll just cut-and-past part of the speech Olbermann gave on Citizens United.

On the cold morning of Friday, March 6th, 1857, a very old man who was born just eight months and thirteen days after the Declaration of Independence was adopted; a man who was married to the sister of the man who wrote "The Star Spangled Banner;" a man who was enlightened enough to have freed his own slaves and given pensions to the ones who had become too old to work read aloud, in a reed-thin voice, a very long document.
In it, he ruled on a legal case involving a slave, brought by his owner to live in a free state; yet to remain a slave.
The slave sought his freedom, and sued. And looking back over legal precedent, and the Constitution, and the America in which it was created, this judge ruled that no black man could ever be considered an actual citizen of the United States.
"They had for more than a century before been, regarded as beings of an inferior order, and altogether unfit to associate with the white race, either in social or political relations, and so far unfit, that they had no rights which the white man was bound to respect."
The case, of course, was Dred Scott. The old man was the fifth Chief Justice of the United States of America, Roger Brooke Tawney. And the outcome, he believed, would be to remove the burning question of the abolition of slavery from the political arena for once and for all.
The outcome, in fact, was the Civil War. No American ever made a single bigger misjudgment. No American ever carried the responsibility for the deaths and suffering of more Americans. No American ever was more quickly vilified. Within four years Chief Justice Tawney's rulings were being ignored in the South and the North.
Within five, President Lincoln at minimum contemplated arresting him. Within seven, he died, in poverty, while still Chief Justice. Within eight, Congress had voted to not place a bust of him alongside those of the other former Chief Justices.