They didn't know why he'd do it, probably just crazy in the head. I do feel better now, but am quite upset as to the medias lack of coverage
Thinking 'outside the box', maybe it wasn't HIS backpack/bomb. Maybe he saw one of the backpacks, picked up, and BOOM. Wrong place at the wrong time and curious.
Ref: Two Middle Eastern looking dudes seen running away from the scene.
/Whoa, had to adjust my tinfoil hat after that thought.