Are you not confusing the evil associated with ideology and the democratic legitimacy of nationalism?
It is ideology which is at the foundations of all conflicts - Communism, Marxism, Socialism, Fascism, and wars of religion - which typically crossed nation states freely.
The nation states have historically protected civil rights. Its why Hitler's first steps were to destroy the national institutions of Germany, or why ISIS destroys the archaeological symbols of the Nation of Iraq.
The Scottish Nationalist Party, may fundamentally rooted in the belief in Scotland becoming a independent nation, but that does not support a belief that they support the same agenda as the Nazi. The Nazi were not nationalist.
Something is not right. This message is just to keep things from messing up down the road