He attacks.
There is no reason or purpose - the choice was almost entirely random.
He attacked because the one he attacked was a balance between susceptibility and visibility.
There is a shock componenet to the whole extravaganza, a need for news media and police.
Yet he keeps attacking.
It is evident that there is no rhyme or reason, even though there is method and structure.
He is methodical and, within the confines of a homicidal fit, quite capable of rational decision.
He strikes at targets taht might fight back first, and then works on the weak and helpless.
But there is no sense to it, becuase there needs no sense.
He is desensitized.
He is without fear, expectation, or even desire.
He isn't afraid to die.
This isn't a form of murder.
This is a form of suicide - death isn't an inevitible outcome, it is the desired one.
This is running amok.
He attacks.
((Idea formed from Definition))