It is so frighten to be morally judged by others not because they would have right, but because those who are judged tend to belief that they are anything else but a subject of judgment.
The tendency derives from the common social practice of making by speaking a step out of us each time when we meet someone else, since our public appearance cannot be the same as our private self-perception. And the judgment is a form of bringing us forward in the same way.
Moreover, when we make that step forward, we play the same game of dominance which is involved in the judgment of those who want to prevail over us. Even if we have the most peaceful intentions of sharing our belief with other people, we need to put other people’s words aside in order to be heard our own.
Therefore, when we are negatively judged, we feel we lose a game started by ourselves. Furthermore, we easily think that other people judge us for a real guilt.
In fact, the moral guilt or its lack cannot be really put forward by anybody, since it is something which belongs to that area from which we don’t get out in the public space. And a guilt which is not in the public space should have a different meaning. Maybe, it is a simple malfunction and not a guilt, nor a sin.