While I'm not saying a deeper layer doesn't exist, son of a copper so I have my own thoughts, his "self-harm" is covered by laws now that we never had years back until people started crying about "think of the prisoners" and "just because he took a life doesn't mean we should disrespect theirs" hence why they now have to be along the lines of "oh, they might hurt themselves so we should be nice" gonad*s.
The real deeper issue is society in all walks of life and stature has some weird fudged up individuals who are prone to kill for no reason or just for kicks and we have had this throughout all of history and until we can work out how to spot this in people it will continue to happen to woman, man and child.
Technology now is thousands times better than before, will still be cases of the wrong person mind, but if there were harsher pelanties for such crimes then we may just see a lessening of them - nowadays people can do anything and the repercussions are next to fudge all.. Eye for an eye and all that, fudge em.