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.
The Don’t exist injunction is different in that it is a belief a child takes on in childhood. The child basically comes to the conclusion that its own death is a viable solution to a problem.
Is there any difference in the self destructive motivations of these two men?
This is what we need to be screening for and indeed this is what I did when I worked in prison identifying suicidal and self harming inmates. If one identifies people with this injunction, as I did with many in the prison system, one knows this person is quite capable of suicide at a later time.