Morbid dreams, killing, suicide,blood, death?

It sounds to me like there is a part of yourself you do not like, or maybe do not trust, but on the other hand it could be someone else completely. It could be someone you feel is dangerous to you, or maybe getting you in trouble. I have had dreams like this and personally I think it is acting out something in the dream that you can't/ won't in real life. Maybe you just see this as the darker side of you. I always see myself in a different perspective, like wearing all black, or sometimes not even being me at all but someone who is capable of these things, like a villain. Maybe it is just a way for your subconscious to get some sort of revenge without actually hurting anyone. It depends on who dies in the dream though, whether it was someone who you feel has wronged you or someone completely innocent.