Above is "empathy" and how it is defined and used. It was easy to see how the mass killer at the Connecticut elementary school obviously lacked empathy. How about the people in the community where this massacre took place?
Did the people there who may have seen him around town or had contact with him, did they have empathy for him? Maybe it was the lack of empathy that existed in the mind of this young man and the lack of empathy that existed in the minds of the other adults that caused this particular individual to be fueled with rage that set him off to where innocent young children, in which each one of whom probably had more empathy than all of the adults combined, were slaughtered. Hard to figure out why they should be the ones to end up suffering the consequences and losing their lives.
Empathy. Either you have it or you don't!