They don't believe that it is something terrible that makes them live in terror. They believe that it is a way to find relief, even though they know that it is an absurd relief that is killing them. They want to stop doing it at a certain point, but they are unable to stop. They become addicted to this strange masochistic pleasure when they hurt themselves and they bleed because their anti-conscience distorts their nervous system. The same way, the girls who have eating disorders throw up on purpose every time they eat because they are so obsessed with their weight...
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