I agree that killing a designated enemy "under the laws of a given nation" for reasons "within that nation" of self defence can be legally and morally justified. However; I disagree with the notion that we can extend that law to include "our" right to legally and morally assassinate any one any place at any time without CONGRESS ITSELF declaring ourselves at war with the country from whence an attack or justifiable danger originated warranting such action. The right to declare war (or act of) simply cannot be passed from one to another or it would have IMO been so written in our constitution.
We seem to be in the middle of the development of a world wide "insurrection" (the weak against the stromg) (impoverished against the wealthy) (the ownership of crucial natural resources) (the value of and need for man's labor in a perhaps static sytem requiring adjustment.
Education may sometimes work against one. Why do you think the English prevented educating (at all cost) the Irish ?