Strange semi related old person story -- back in highschool, one of our teachers had the class write essays on whether nationalism was good or bad. We were then given an option to either present our papers, or do a debate exercise with a kind of round robin pro or con. So you'd partner with 1 other person, debate if it was good or bad, then groups of 4 doing the same, until it was the whole class. In my paper and in my discussions, I had used a similar approach as this comic -- basically just establishing what nationalism was vs patriotism, and drawing nazi's in as an example too. No one in those discussions contested that Nazi's were nationalists -- but they still argued in favour of it.
By the end, I was the only person who thought nationalism was overall 'bad'. The tide had turned in the groups of 8 stage. Because a hot girl had declared her support for nationalism. That's all it took for people to like/excuse nazis, even back in the early 2000s. An excuse.