Alleged Army whistleblower felt angry and alone

With his custom-made "humanist" dog tags and distrust of authority, Bradley Manning was no conventional soldier.

Ostracized by peers in Baghdad, busted for assaulting a fellow soldier and disdainful of the military's inattention to computer security, the 22-year-old intelligence analyst styled himself a "hactivist."

On Tuesday, the U.S. Army charged him with multiple counts of mishandling and leaking classified data and putting national security at risk.

Manning is suspected of leaking a classified video that shows a group of men walking down the street in Iraq before being repeatedly shot by Apache helicopters.

In a …