And it is still far too easy for those without conscience to manipulate whole communities into fighting among faiths and tribes.

CENTERFORSECURITYPOLICY: Center For Security Policy

Ultimately, the authorities concluded that Willingham was a man without a conscience whose serial crimes had climaxed, almost inexorably, in murder.

NEWYORKER: Trial by Fire

"Entrepreneurs tend to have a singular weakness that allows them to do things without checking their conscience, " Zaleznik said.

CNN: Segway inventor reveals 'toughest question'