Sniper mask is controlled by the masks code. His mask is defective because of the crack  so he has his will and is able to talk. but he still is controlled to make humans kill themselves and jump or just kill them. Also the masked can't hurt people who are "closer to god" because the true goal of the masked are to find the "one true God". Also even though the faceless mask is rare there are people who are closer to god. The faceless mask is usually found in a white box hidden in random rooms.