I hear ya, but while the attackers actions indicates that they are irrational to an extreme, what is written there in the paper that you’ve quoted is purest fiction. When a normal person, and not a tabloid writer or editor, makes statements of the kind quoted, they are advised that they are engaging in “mind-reading” and advised to stop imagining they have that ability because it is very unhealthy.
The writer of that nonsense had/has no idea what was in the mind of anyone at all when the attack occurred or any other time. Someone could arguably make assumptions or generalizations about what the attacker’s state of mind was after an act of violence. They’d have to use the first hand accounts of other people who recount what they felt after such an act, and anyone reporting feeling nothing would probably also be accounted as going into shock.