there is a part of the brain that is necessary to feel empathy / sympathy for other people.

psychos DO NOT HAVE THIS PART.
THEY ARE BRAIN DAMMAGED.
a m.r.i. or cat scan is all that is needed to make this determination.

in all these mass killings, there were teachers, classmates, and even parents who knew there was 'something odd' about the shooters.

there is no good option currently available for a parent who fears his / her psychopathic child.

the police will do nothing untill a crime is commited.