[i]That's true enough, but its not as straightforward as that. If the intention is merely mass murder, that argument holds. But there are lots of other circumstances where the emotional/psychological position of power over the each individual victim seems to have been important and those weapons don't do that. I'd put Columbine in that group, for example.[/i]

Armchair pop-psych aside, there are countless instances in which bombs of varying type have been used as the weapon of choice in assassinating specific individuals.