Timothy McVeigh

He grew up in New York and served in the military, earning a Bronze Star and almost becoming a part of the Special Forces. Who knew that he would ultimately be responsible for killing 168 people and injuring over 600 in the Oklahoma City bombing?

Anders Behring Breivik

The psychopath set off a bomb from a van in Oslo that killed eight. He then went on a mass murder shootout at a summer camp, killing 69 people (many of them children and teenagers).