Leaders from Human Rights Watch and Harvard Law School's International Human Rights Clinic last week issued a dire warning that nations around the world haven't been doing enough to ban the development of autonomous weapons — so-called "killer robots." The groups issued a joint report that calls for a complete ban on these systems before such weapons begin to make their way to military arsenals and it becomes too late to act. Other groups, including Amnesty International, joined in those urgent calls for a treaty to ban such weapons systems.