Former President Donald J. Trump had a very good year at the Supreme Court. On Monday, the court ruled that he is substantially immune from prosecution on charges that he tried to subvert the 2020 election. On Friday, the court cast doubt on two of the four charges against him in what remains of that prosecution. And in March, the justices allowed him to seek another term despite a constitutional provision barring insurrectionists from holding office.Administrative agencies had a horrible term. In three 6-to-3 rulings along ideological lines, the court’s conservative supermajority erased a foundational precedent that had required courts...