It's blame in the sense of responsibility, not in the sense of just feeling bad. I tend to frame things in terms of heroic responsibility, but a bit more regatively -- in terms of negligence. Every day I go out and sin against people, by commission or omission (or, in a more secular phrasing: every day I go out and metaphorically punch a few people in the face, in my thoughts and in my deeds, in what I have done, and what I have failed to do).

The reason I use the word 'blame' is because the harm I inflict on others is real and it's not alright. The fact that I haven't figured out how to be less negligent, more empathetic, etc does not magically mitigate their hurt. I use the word blame because working out right actions is not an abstract question that I plan to apply in the future, it's something I'm doing fumblingly enough to hurt people now, so I'd better improve right quick.