I would guess just about everyone has nightmares. I do, lately not too often, thank heavens. I've had some pretty gruesome ones about decomposing bodies and that type of thing. You mention that you feel "nothing", yet your dreams are full of violence. So although you're not consciously feeling emotions, your unconscious is definitely working on something. In the dream the children are mute and in another part you are frozen. I'd hazard a guess that you are holding back some emotions and this is what your unconscious is telling you. Because of the gruesome aspect of the dream, I'd guess that the emotions are somehow unacceptable. Maybe anger?

I'm only guessing here because you asked for feedback. I do a lot of dream work with my therapist, and I find dreams utterly fascinating. I've gotten much better at interpreting my own because of my therapist's help, but I'm only guessing in your case. Maybe someone else will have some ideas.