One of the most important steps we, as veterans with PTSD, have to make is accepting that what happened was not something we could have prevented or changed the outcome of. As Rod Deaton says, we veterans are 'intensely intense'. Most, if not all of us, feel that accepting what happened means that we stop fighting the guilt that it is our fault. Here's the hard part:
The instinct to fight is what also keeps us motivated to continue fighting for a better life.
Many of us (myself included) have tried to accept what happened. What we were really doing was feeling guilty that what happened was out of our control. We end up surrendering to the guilt. It can feel a lot like acceptance, but it is not. It's insidious. What has really happened is that by surrendering to the guilt, we have given up fighting and we convince ourselves that giving up on having a good life - it's just something else we have to 'accept'.
When I made this realization about myself, I felt even worse about myself, knowing that the last thing that I wanted was to give up on myself. It was back to square one with the idea of acceptance. In short, I hadn't actually accepted anything. I just gave in. That's what made me feel worse about myself.
So there you have it. I hope this makes sense.