In some ways, the Supreme Court term that just ended seems muddled: disturbing, highly conservative rulings on subjects like voting rights and gun control, along with important defenses of basic liberties in other areas, including the rights of detainees at Guantánamo Bay, Cuba. The key to understanding the term lies in the fragility of the court’s center. Some of the most important decisions came on 5-to-4 votes  a stark reminder that the court is just one justice away from solidifying a far-right majority that would do great damage to the Constitution and the rights of ordinary Americans.

The Supreme Court abandoned its special role in protecting voting rights when it rejected a challenge to Indiana’s harshly anti-democratic voter ID law. Critics warned that the law, which bars anyone without a government-issued photo ID from voting, would disenfranchise poor people, minorities and the elderly, all of whom disproportionately lack drivers’ licenses. The critics were right. In the Indiana presidential primary, shortly after the ruling, about 12 nuns in their 80s and 90s were turned away at the polls for not having acceptable ID.

In another sharp break with its traditions, the court struck down parts of the District of Columbia’s gun-control law. After seven decades of holding that the Second Amendment’s right to bear arms is tied to raising a militia, the court reversed itself and ruled that it confers on individuals the right to keep guns in their homes for personal use. The decision will no doubt add significantly to the number of Americans killed by gun violence.

Corporations fared especially well in this term. The court reduced the punitive-damages award against Exxon Mobil for the 1989 Exxon Valdez oil spill from $2.5 billion to about $500 million, a pittance for the energy company. In the process, the court declared that in maritime cases, punitive damages should not exceed the actual damages in a case. It is a rule that foils the purposes of punitive damages: to punish and to deter bad conduct.