Particle_Man
Explorer
maybe not. If there is a powerful leader of multiple tribes of orcs, and you dominate an orc and tell it to kill orcs of a different tribe, that would not be against the orc's nature. (Or if all orcs love each other in your world, substitute orcs and goblins for two orc tribes).
Since evil can fight evil, good can use dominate person to help that along.
Since evil can fight evil, good can use dominate person to help that along.