I'm not a therapist, so my area of expertise is myself and not anyone else. Nonetheless I could say how I would interpret a dream like this. My therapist is Jungian, so we often look at people in the dream as parts of ourselves. This crying, begging victim could be a part of yourself that you aren't acknowledging. He could represent certain feelings, capacities (creative capacities, emotional intuitions), etc. It would be interesting if you could say more about the people who annoy you and what annoys you about them. It is likely that some part of you annoys you in the same way.

Are you aware of being angry when you kill the victim? Any thoughts of revenge? It's not unusual that a person feels like they are so angry they want to kill someone.

But also the killing might not be done out of anger---killing the victim is a way of silencing them, preventing them from making their feelings and ideas heard. So look at what in your own latent abilities and feelings you are silencing and/or not acknowledging.

Mike