There really are no court decisions that are “controversial,” if a justice adheres faithfully to the written intent of the U.S. Constitution. He or she simply cannot err if they stick to the law.
All their decisions will be legally and constitutionally sound, therefore correct under U.S. law.
If one is a strict originalist concerning things constitutional, as in the case of Justice Scalia, one’s decisions cannot be called, in any sense, extreme
So where do progressives get this strange idea that conservatives on the court are extreme?