There are several things that I've had to do with regard to survival guilt.
One is that I have to keep bringing my thoughts round to the responsibility being with the perpetrators, not with me. I don't say remind myself or tell myself, because that isn't strong enough. It's almost like I have to physically move my thoughts, using a lot of effort, to keep bringing my consciousness to how things actually were - I didn't perpetrate what happened, they did. What happened to other people was not my fault, it was the fault of the perpetrators. They had the power, not me.
Another thing is that I see that my "job" wasn't to save other people - I couldn't. My job is to work on recovery now - that, I can do. I see working on my own recovery as a way of honouring people who couldn't/can't escape. Maybe this doesn't make sense to other people, but I believe we're all connected energetically. What I do makes a difference to the energy in the world. If I get stronger, it adds to the potential for other people to be strong. If I heal, it adds to the potential for other people to heal.
There may be people in the past who I couldn't help. Tearing myself apart about that now doesn't help them. It doesn't help them to hold them forever in that past place of suffering, and I think I am holding them there in my mind when I feel the guilt. It's a kind of distinction between honouring their experience, and me being stuck in the fact that they had that experience. I need to "allow" that experience to end for them, and let them be at peace, or be healing now.
I also find rituals very helpful. Rituals for them, which also help me to let go of them. (In the same way that we have rituals like funerals and wakes to help us let go when we lose someone.) For example for someone who died related to one of my traumas I've made a cairn for them (
http://en.wikipedia.org/wiki/Cairn). I did this in a place that was very peaceful and appropriate to them and the situation.
I've also done rituals to separate from someone else's past suffering, for example when I made the cairn I started with rocks and a living plant together, then deliberately moved them apart as a symbol of separation. The cairn represented something I can't change and the plant, which I then planted somewhere else, represented me leaving that part of my past and continuing to heal in the present, away from it.