I know I said that I was done with this, but I will just add this:
I read your “A-B-Heaven-Hell” scenario more closely, and I don’t think you and I disagree, I think we are just talking past each other, and I will take the blame for that. I find “blame-assigning” and “fault-ascribing” to be more in the province of Grade 3 students quarreling in the schoolyard, but anyway:
As I said, I do not judge people, but I do call out behavior as mortally sinful. If I say to someone, “you will surely die”, or to put it another way “that thing X you did is mortally sinful”, I have not judged the person, I have just judged his behavior, the outward act. What is going on in his head, soul, and conscience, that I cannot know. If he asks for elaboration, I can explain that if you know X is a mortal sin, and you fully want to do X, then it seems that you have, indeed, committed a mortal sin, but I cannot see inside his soul, to know how all this fits together. Only God can do that.
Yet your garden-variety modern will scream bloody murder if you point out that the X he did is mortally sinful. His first words? “You’re judging me! Stop!”. I like to think I know just a little bit about human nature, and if I had to guess, I’d say that I’ve hit a nerve with that guy. Deep, deep down, he knows. He might not be able to articulate it, but it breaks out like this: His conscience is pricked. He’s long ago dismissed the idea that X is sinful. He doesn’t like being reminded. It hurts. For that brief moment, he is called upon to choose God or choose Sin X — he can’t have both. Yet all I did was basically read him the catechism. In reality, he is judging himself, but because he can’t admit that, he accuses me of having judged him.