JOS, Nigeria—Anguished citizens of terrorized Plateau State, Nigeria, forced lawmakers to see their pain up close and personal Aug. 25 by hauling the corpses of victims to their front door. They marched by the thousands to the Government House in Jos, the cosmopolitan capital of Nigeria’s northern states, beside biers of flatbed trucks carrying the corpses of 36 Christians killed the previous day. The grisly mass murder was the latest in the growing number of sectarian killings in Plateau since mid-August. The protestors, chiefly women and young adult men, wailed at the gates of the Government House for hours, alleging the government had abandoned them to be wiped out by terrorists. The city has been torn by killings since a mob attack in a northwestern suburb on Aug. 14 killed 22 Muslims. The Muslims were attacked after being surrounded by a funeral march for victims of an earlier attack by …