What Pushes Shooters Over the Edge?

After a week of deadly shootings across the country, including at least six-high profile rampages that killed 24 people, Americans are asking what made these mass murderers snap. A man guns down five people at a city council meeting in Missouri. In Los Angeles, a standoff leaves four family members and a police officer dead. On the campus of Louisiana Tech, a nursing student kills two of her peers before turning the weapon on herself. In Maryland a gunman opens fire in a restaurant, killing...Full Story