When I was in the French Foreign Legion the natives would shout out the most ignorant things at us while we marched through their towns on parades or etc. Its a elite military compiled of ONLY foreigner's who go to war FOR FRANCE. Its seperate from the French Army, but gets paid by the French Army. They would literally shout things like "go home and get a job" "aliens" anything towards get out of our country and find work....all the while us foreigners would go and wage the ugliest of battles known to man.
I think if humans could for just one minute, take down the walls, all around the globe, this world would be a much more productive, and peaceful place. When your always guarding boarders, there is always going to be bloodshed. But when there are no boarders, and people are free to roam the earth as they please, THEN there is LIBERTY, and The pursuit of Happiness.