Psychopathy can be easily trained into humans. All it takes is for societal restrictions to be removed from the mind. The US Marines have been doing this for decades.

The quote I gave above is, in fact, from the U.S. Declaration of Independence, not the U.S. Constitution. It is, however, correct and recognized to interpret the constitution through the lens of the declaration as the foundational document of the independence of the American colonies from Britain an so provide the rational basis upon which the U.S. is founded. So, though the words I quoted do not appear in the Constitution, I still consider it a valid point.