So the court renders opinions and..... nobody has to follow them?
Sorry, that's patently untrue.
Negative. It is Exactly true.
The courts can do nothing except offer opinions. They have no other authority.
And therein lies the danger - others will not respect those opinions.
If a court says, for example that a sanctuary city needs to cooperate with ICE, they cannot enforce it. The need someone to RECOGNIZE that authority.
Otherwise, sanctuary cities can just thumb their noses at the courts or the Executive or Congress for that matter.
Wait, that is already happening.