Hey, Neil, what took you so long?
SCOTUS had opportunities to intercede in the tyranny but they chose to weenie out of it.
SCOTUS rarely intercedes in this manner because it is rare for an issue to be the subject of a legal challenge where a SCOTUS ruling is required to stop immediate and irreparable harm. In almost every case that is subject to important constitutional scrutiny, there is no harm in letting the case proceed through the normal appeal process — which can take several years.
I would point out, though, that it is likely the Supreme Court will be involved in the next few years quite a few cases involving civil rights violations by state and local governments — and many employers, too.