The nine US Supreme Court justices are appointed for lifetime terms. This is supposed to keep them above the political fray (ha!) It makes them enormously powerful. They are the ultimate arbiters of whether laws and legal decisions are consistent with our Constitution or not.
The GOP has kept its eyes on this prize for the past five decades, nominating judges as conservative and as young as possible throughout the federal judiciary. The Democrats (my party, although I don't feel able to vote for most of them right now) have lost sight of the Court's importance (and the judiciary in general) apparently until today.
I have messages today from progressives close to me full of gnashing of teeth and rending of garments. The time for that was November 2016 (and believe me, I gnashed and rent then!) Trump's election (and McConnell's heinous conduct toward the Garland nomination) cemented this outcome. I am surprised anyone is surprised by it.
I can't explain it but I'd like to add a 2nd question, which is why did the Democrats never seem to try to secure the Roe vs Wade ruling on a federal basis?
Good question.
Maybe because men on the left also believe women to be less than full humans and therefore less than full citizens?
Natasha Chart wrote an interesting piece about this at 4W recently:
4w.pub/how-a-decade-of-democratic-delusions-failed-women-on-abortion/
I can't vouch for its accuracy because the time period she describes was very difficult for me with personal health crises and I wasn't paying a lot of attention to political detail then.