MANILA (Reuters) - A top Catholic archbishop on Sunday called for Filipinos to choose peace over violence and end a spate of drug-related killings that have divided the nation.  Archbishop Socrates Villegas, president of the Catholic Bishops  Conference of the Philippines, was speaking as the church launched a new prayer campaign to  heal the nation and stop the killings  in the country. Philippine Catholic bishops have been stepping up opposition to killings blamed on a government crack down on drugs. They are now asking the faithful to pray with the rosary for 33 days until Dec. 8, an important Catholic feast of the Immaculate Conception. The new campaign follows the 40-day ringing of church bells and lighting of candles for thousands of people killed in President Rodrigo Duterte s 16-month war on drugs. More than 3,900 Filipinos have been killed in what the police called self-defense after armed suspects resisted arrest. Critics dispute that and say executions are taking place, with zero accountability, allegations the police reject. In a mass for families of victims of drug-related killings, Villegas said that if the killings continue  a curse awaits a nation that kills its own people . Symbolically, the mass was held at the Catholic shrine of Mary Queen of Peace which stands on the site where nuns stopped soldiers from attacking mutineers who overthrew dictator Ferdinand Marcos in 1986.  Why do we applaud the killings?,  Villegas said in his homily.  We chose violence instead of peace. We chose lies instead of truth. We chose to laugh at obscenities instead of correcting these. We chose to be silent than to be involved.  Human rights lawyers, politicians, civil society groups and opponents of the president joined the families of victims in a religious procession after the mass to the  People Power  monument, where they held a cultural show.  Harry Roque, presidential spokesman, said the government welcomed  constructive dissent  after hundreds joined the religious activity condemning the killings.  We reiterate that this administration does not - and will never - condone extrajudicial and vigilante killings,  Roque, a human rights lawyer, said in a statement, adding police have been investigating more than 2,200 killings with drug-related motives.  Accountability is essential to good government. The president himself made a clear stance that any violation committed by the police during operations would be dealt with accordingly.  Roque asked Catholic bishops to work closely with government on drug rehabilitation and in its anti-drug campaign. 