OA,
I would suggest the experts state your concept is but "one" of the things that must be done.
Just as providing security and a safe environment for the "Hearts and Minds" programs to be carried out. Until the NGO's, Civil Affairs, sewer workers, electricians, and teachers can return to work and rebuild the infrastructure and teach children, render medical care, build roads, your method alone has no chance of succeeding.
Until the Radical Fundamentalists cease poisoning young minds with a religion of hate and murder there will be conflict.
Perhaps all of those contributions in New York and Boston came from descendants of the Irish that were victimized by the English all those years ago, but that was brought about by a deprivation of freedom and not the defeat of a tyrannical regime that resulted in millions becoming free.
Thus comparing NI and Iraq and Afghanistan are illogical.