Answer:
Evil, usually.
Step-by-step explanation:
When people think of nationalism they think of Nazi Germany and Japan and Fascist Italy, and these places all thought themselves superior to everyone. During WW2 All of these countries committed atrocities, such as the holocaust. Although nationalism can lead to patriots fighting for their country in times of war, which is good depending on who you ask.
Please note that all sides committed atrocities during WW2