> They can't pick and choose "oh no they are in jurisdiction of law A but not in law B". Jurisdiction is a fundamental concept, there's no middle ground.

I mean, they shouldn't do this but clearly they can rule however they want with any pretext they want, because they answer to nobody but themselves. Who's going to tell them they can't do something? Who is left to appeal to?

It's a deeply corrupt and undemocratic institution, with virtually unchecked power to rewrite legislation and even the Constitution at a whim.