We recently learned that four armed Broward County police officers, including the School Resource Officer at Stoneman Douglas High School, stayed outside and did not attempt to stop the murderous rampage. Just as appalling as this inaction, however, is the fact that they may not have had a legal duty to attempt to stop the carnage. Courts across the country, including the Supreme Court, have repeatedly held that the Due Process Clause of the 14th Amendment imposes no duty on the state to protect an individual from private violence. In DeShaney v. Winnebago County, the Supreme Court held that...