Yes, but there's nothing in your argument to back up your point that a disparity in wealth has been a result of NAFTA. You could just as easily make the argument that the reason we have lost manufacturing jobs is because technological innovations have made it easier to off-shore production to the lower cost jurisdictions in Asia and the developing world.
By the way, on the degree of fairness, are we supposed to ring-fence our societies and our economies and say tough luck?