The moment the Supreme Court upheld the individual mandate to purchase health insurance under Obamacare, the primary defense of the law became “It’s the law!” Since talk began of a budget impasse over defunding this particular law, that refrain has become ubiquitous. There’s just one problem: It’s a tautology that doesn’t actually make an argument.
Every law began as a bill that was “passed by Congress, signed by the President, and approved by the Supreme Court.” Laws, once written into code, do not become inviolably permanent. Even such duly-enacted laws can be repealed or defunded by Congress (with the President’s permission or by overriding his veto). Democrats in 2007 tried to defund the Iraq war, even though it was legally authorized by Congress, i.e. “the law”.
Surprisingly (except not at all), Democrats aren’t consistent sticklers for maintaining the status quo of the law in all cases. I will list a few examples, though it should be self-evident that the “progressive” party would be generally in favor of changing the law over time.