The human psyche is no different. When we see violent images we naturally desensitise and after recuperation we come back mentally stronger. It all a matter of degree.
Self harm in a wider context
This allows the Free Child to again be re-experienced instead of cut off and thus one gains a sense of reconnection or wholeness in the personality. Unfortunately it’s only temporary. The intense stimuli can be cutting self with a razor blade, some sexual experiences or engaging in high risk behaviour.