As far as I am aware I was not talking about serial killing or murder ... just said that Bella might be psycho which could result in anything - not necessarily burning down the dorms or the library - but there are so many things a psycho could do; and Bella clearly is damaged goods in that respect.
I don't think Bella or anyone else is going to turn psycho, regardless of what degree they could be psycho. Bella is damaged, yes, but it's far more likely to be something she can recover from with the right help. DPC's warning at the start doesn't necessarily mean this game will go down an AL-style dark path, but could simply go down a path of giving us very sympathetic characters who are dealing with issues that may hit a little close to home.
I already experienced that with Maya and Josy because I grew to really like them and when the events of Eps 3 and 4 happened it wounded me quite a bit because it brought back a lot of painful feelings and memories of heartbreak which I've experienced before, and it sucked just as much now as it did back then.
So Bella may be going through something traumatic but that doesn't make her a potential "psycho", it just makes her human, and it's this very human emotion she's feeling that might be the kind of thing DPC was warning about as it may affect some people who have gone through something similar.