Aside from these personality profiles being pure speculation, the sample size in my honest opinion is nothing to go off of. Four people do not make up even a small fraction of the murders that occur everyday, these just happen to be a few that took off with the media.
Personally I do see INTJ's being able to shut themselves down emotional to the point that they would be able to commit such atrocities without batting an eye or shedding a tear, in some cases my own response to situations that drive others to tears is to turn into a robot of sorts, disregarding all emotion and just going through the motions to keep things moving forward.
Thankfully we tend to use our talent for finding solutions and digesting information for more beneficial tasks that taking the lives of others.
Personally I do see INTJ's being able to shut themselves down emotional to the point that they would be able to commit such atrocities without batting an eye or shedding a tear, in some cases my own response to situations that drive others to tears is to turn into a robot of sorts, disregarding all emotion and just going through the motions to keep things moving forward.
So a stereotypical INTJ is capable of anything?
Thankfully we tend to use our talent for finding solutions and digesting information for more beneficial tasks that taking the lives of others.