Because, if liberals don't LIKE a law.....it doesn't really exist.
Follow up bump...an official term for this is "moral relativism". Simply stated, there is no right and wrong, and the reason people prefer this is because once such a person acknowledges that there is right and wrong, he/she is accountable.
It's the same reason that some don't want to believe in God (the true one), because the second they do, they are accountable to Him. That blows out the rationale for their acceptable behaviors:
love of money/people/elites (1st Commandment), foul language, or living nuanced lives while claiming to be His (3rd), taking a day off to worship and rest (4th), honoring parents (5th), murder/abortion/hate, theft, lying/slander, adultery/lust (6th-9th), and coveting (10th), which includes 1-9.
That is a more theological answer to the original question.
I think the "Moral Relativism" of the left is a myth they propogate on par with their legendary "compassion for the little guy" and "concern for the well-being of minorities". Moral Relativism would be far preferable to whatever it is liberals are doing. At least with Moral Relativism, conservatives might come out ahead 50% of the time.
I would say that Libs today practice an extreme form of Moral Absolutism, on par with Al-Qaeda or The Spanish Inquisition. Remember James Carville's book: "We're Right They're Wrong". That's the exact opposite of Relativism.
If any libs are reading this, please note that I am not questioning your patriotism.