The left hates US law because it is enshrined in the US Constitution, a founding instrument designed to protect the people from an oppressive government.
Obama criticized the Constitution, calling it a “charter of negative liberties”. Seems he was opposed to the limitations on federal power written into the Bill of Rights; “Congress shall make no law...” statements which got him all wee-wee’d up.
There has been a lot said about “American exceptionalism”. I think the basis for America’s exceptional quality lies in the Supreme Law of the Land imposing limitations on government power from the nation’s very beginning.
Leftists don’t like this. “Do as thou wilt” and “the end justifies the means” is more their style. They yearn to be benevolent dictators, benevolent in their own fantasies but dictators in reality. And dictators make up their own rules, and they frequently kill vast numbers of their own people.