Premise: How else can people understand tragedies such as Littleton, in which normal middle-class kids are not playing baseball or flirting with girls or even duking out their differences after school on the playground; they are nursing monstrous visions of murder and mayhem, while building bombs in their clueless parents' garage.

Hypothesis: The middle-class kids in Littleton engage in the usual things like playing sports and flirting with their crushes.
Relation: contradiction