Maybe I don’t get around enough, but I don’t think I know anybody who hasn’t done that. “Cafeteriaism” is usually a matter of rationalizing what we want to do, so we do not have to admit it’s sinful. It’s practically the cornerstone of protestantism, but it’s hardly limited to protestantism. I have always understood that the Particular Judgment is an event in which our sins will appear in the full panoply of their evil. Sin is a remarkable thing. It’s like a stone thrown into a pool. It ripples, then rebounds, then ripples some more. We might make some cruel remark to someone at age 16, and that person hits his wife 20 years later because the remark, buried in his consciousness, still stings. Their child might see the blow and doubt the wisdom of marriage because of it. On and on and on. We might have long forgotten the remark after having decided that it was really okay to make it because it was good for the victim to be “taken down a peg”.
Life is so full of that kind of thing, I am kind of surprised at your comment. To a degree, “Cafeteriaism” can be said to be part of the process whereby we find a way to accept the unacceptable by constructing a world in which it is acceptable. The unacceptable, of course, is the sense of having sinned. St. Therese of Lisieux proposed that in the Particular Judgment, we see, for the first time, the full reality of everything we ever did. It is, she said, utterly devastating. We are then offered forgiveness. But forgiveness requires admission. Some, she said, find such forgivness demeaning of our inflated sense of ourselves, and choose, quite freely, to seal ourselves in a world in which we choose self-worship as the only means of remaining self-justifying. That world, of course, is hell.
That is why it is so important to develop a sense of admitting to “being wrong”, and to guard against self-justification. But again, I submit that all people do this to one degree or another. I believe Jesus said something to the effect that even the just man sins seven times a day. And sometimes that just man does not admit that some of them were sins.