Chief Justice John Roberts has been exposed, wrote legal observers Dahlia Lithwick and Mark Joseph Stern for Slate. He may pretend to be the deliberate, moderating force on the Supreme Court, but behind the scenes he has become as reactionary as the rest of the court’s right wing. This became clear after the court handed down its radical decision giving former President Donald Trump a presumption of immunity for “official acts” in office, reversing all lower judges who considered the matter, all while leaving unclear guidance about how exactly to define an official act, they wrote. Their featu…