One thing that makes SCOTUS interesting is that they have no enforcement mechanism. It's mainly only tradition and respect for the institution that causes people to follow Supreme Court rulings. If the executive branch suddenly decided to do whatever it wanted, as long as they had support within their own ranks, including the military, there'd be no one to stop them.
On the flip side, this means that SCOTUS has a huge incentive to do their best to figure out what the actual right thing is, and rule that way. Because if too many people think SCOTUS is a shady group of individuals whose rulings are arbitrary and don't deserve respect, that's it for their power. And that's why even when I believe one of their rulings to be counter to my values, I can usually understand why they came to the decision they made, and at least respect the process.