Very intelligent analysis.
I bolded a couple of phrases that I feel really make the point clear.
Let me add too that violence takes many forms, and this is often forgotten.
I think obviously ALL types (ie. ALL humans) are capable of being violent if pushed to their extreme, be it by someone or something else, or by their own fatal flaws. The way I see it is that in the case of INTJ's this type can be so oblivious to their own emotional state (not to mention other's), and in such deep denial (because they despise and feel uncomfortable with messy emotions and don't value this aspect of themselves enough) that they end up fucked up emotionally (we're ALL emotional...I know you INTJ's HATE to admit it so much you'd rather roll around in broken glass, but you ARE), bottle everything up and then blow like a freakin nuclear reactor destroying everything that's close to them.