@Cowbell:
I can empathize with you completely, I also know these obsessive feelings, and just like you, I can't stop them, I can't forget the images that triggered and still trigger them. I feel like a helpless traitor whenever I notice that I have forgotten about them for some time, and I know, I can't really help the victims.
I had watched videos of animal abuse and torture on some animal welfare organizations' website. I cried waterfalls and couldn't stop, I was completely distressed, knowing that every single second something similar is happening in this world, and I can't stop it. I even started to torture myself (burning my skin) believing that I would thus be able to alleviate some of these poor creatures' pain.

I talked with my T about it, and he said something like I don't want to allow myself being happy and satisfied, that I feel guilty for something I am not responsible for. I had to disagree with him, and maybe that was his intention, too, because he wanted me to learn to distance myself from emotions that are not mine.

My T also said that it is possible that I have projected some subdued feelings for my mother (guilty conscience because I feel incapable of making her happy) onto these images and can now allow myself to go through these feelings completely.

Maybe there is an older conflict inside you too that was triggered by these images and now coalesces with your emotional reaction to the events in CT.