I dunno, seemed pretty premeditated, the way runvardh put it.
Shit, you guys are psychos! So much for the fluffy NF thing, eh?
The interesting thing about that 'core value' thing, for me, is how the INFP differentiates (if they do at all) between their own core values that they acknowledge are sort of a "them thing", and the ones they actually expect other people to understand and respect.
Because... well, I've had conversations with my INFP where she's got really annoyed at somebody for something she's said was just "beyond the pale", and yet when she described it to me, I thought it sounded like the sort of thing that at least half the population wouldn't bat an eyelid at, and of the remaining half, half of them would be just mildly peeved at worst. And yet she was completely livid. I've had a tough time then, trying to persuade her that it's not fair or reasonable to expect everybody else to live by her personal values, or to get so worked up when they don't.
The idea of these highly idiosyncratic personal values, coupled with that psycho type potential, could make for a very unbalanced person indeed!
You missed the part where he said he was pushed over and over, till he had to stop it. And that is important. We'll let you push and push, and be polite while we ask you nicely to stop. And after a while, we get fed up with being ignored. And let the Beast out.
When I was younger I would get so angry I would lose small blocks of time while I went on a rampage. Yet I still never permanently injured anyone.
Unless I felt a life was in danger, I wouldn't go so far as to literally attempt to kill anyone. Even in a rage.