Not my fault----you profess to be full of forgiveness so it's an easy enough question. No use generalising if there's one case in particular where you can't forgive, you either can or you can't. This is where we differ greatly because I call a spade a spade in my beliefs and folk know exactly where they are as I'll never waver on anything with my own beliefs so you SHOULD be able to answer.
You will also be aware that I don't do "SHOULD". I'm not certain how I can -HONESTLY- answer how I'd react to something I've never experienced. The most I CAN say is that I'd do my best to understand why something was done, but that doesn't mean I'd condone the act. It sounds to me as if you make a decision and stick to it like glue, come what may. It doesn't tell me, though, how you feel about that decision. If you accept that the taking of life is murder, how then, is it possible to show compassion for mercy killings? From an objective position, I can weigh each crime against another. From a subjective position, I'd find it much more difficult.