As I've wondered a few times here on the Slog (starting here): Will we human beings ever learn to react to extremism with enlightened moderation rather than with reciprocal extremism?
Here's a related thought about nationalism. Pfft, on second thought, what the hell, I'll just reprint it below:
Nationalism is always a noble-seeming mask for xenophobia.
Show me someone who loves "Us", and I'll show you someone who hates "Them".