And what came first? If you have a disorder, you'll probably start to develop it in your teens, but there is one disorder that can show from a very young age:
antisocial PD. If its that, then the childhood could be troublesome because of that (getting punished a lot, getting in trouble, etc.). I've JUST had a class about personality disorders (I swear, this thread just complimented my class so well) and I know that there could be comorbidity (one disorder can be paired with another disorder, it isn't uncommon, just like you said, it could be paired with a narcissism PD). You should have a read about Cluster B (most common types of disorders in prisons and can lead to criminal behavior).
A LOT of the PDs in that cluster say something about risky behavior and addiction (the weed references on his fb pages, as
@JuicyLucy said in a post on this thread).
It doesn't always mean that his family or his situation was bad, a disorder (IF he has one) could have other causes (biology, genes, bad friends maybe). With some cases it isn't clear what came first: Cause or Consequence? What was first? If the forensic psychiatrists will talk to them, they'll figure that one out. Its an interesting topic (as my teacher said, lol).
If you wanna know the classifications of a disorder, just search for DSM-V (
a very big online pfd) for the psychological criteria (search in the pdf: Cluster B). Its very interesting and if you're interested in psychology, you'll be interested in that. There is a chance that he has a PD, but there are so many other psychological disorders and all that, that you can't know for sure unless they test him (the test for PD in Belgium and the Netherlands is called DAPP-BQ, if you wanna know).
That all said, its all with ifs and buts as the guy can just be a regular guy that's just a bad person. It needs to meet certain criteria (see DSM-V) and be tested. There can be a hunch, but all that is because of talking to the person. You've probably seen a lot of questions in my reply and that is why.
![Wink ;) ;)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
You do have a point, but like many things: its situational. We nearly don't have enough info to put a name on a possible disorder that he possibly has. Psychology (sadly) isn't black and white.
I do like it that you're interested in psychology, keep up the curiosity!