The dangerous cryptids I've dealt with have either been mindless animals, or people who were made into monsters the same way humans are- making the choice to hurt people. Even the Jorlac [ A species of sadistic telepath commonly known as "cuckoos" for their inclination to leave their offspring to be raised by human parents that the children usually later murder when they come of age. They control minds to get what they want and leave destruction in their wake, usually. ] have exceptions, individuals who resist or lack their usually strong predatory instincts.