Ive been having a few bad days too. Even moments of such an anger that I felt almost like at the beginning of this whole mess I had to go through.
Which reminds me - YOU CAN NEVER UNDERSTAND a Psychopath. EVER.
And when I think how much is wrong with the world and how I could not change that in the next ten lifetimes, it gets me really down. I sometimes feel like there isnt anyone out there who thinks like me - that it is simply wrong to hurt others, and its also wrong to see hurt and not do anything about it, or at least say anything...
I wish I could write you something that would make you feel better, Whitefeather, but I dont feel I can now. All I can tell you is that all of those bad emotions, that you are going through are a bliss. They are a bliss because they tell you whats wrong. They are your inner guide, telling you what you do and dont want. They are your guardian, your inner radar. Listen to them and learn from them. Healing will come, but its up to you to decide how much you learn.
And have you tried reading? (it has helped me a lot, now I bought another book). There are some really great books on psychopathy, that explain the condition (It will help you with all these questions of "why") - Robert Hare's "Without Conscience" is a must!