What do we need countries for? Just to fight each other? What's the point of dividing humans according to arbitrary differences like appereance, language, culture, place of birth?
I've been brought up as a hardcore patriot, told that patriotism is good and people who saw themselves as citizens of the world were false, traitors. Was that just indoctrination? Is patriotism the real evil here?

Why would I ever want to fight for "my country"? Why would I ever want to kill for it?