system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: why is nationalism/patriotism seen as a good thing in the USA, but is seen as a bad thing in Europe?

For example the EDL in England would often be seen as a group of thick brutes, but a similar group America would be held up as a paragon of virtue.
gpt
The U.S. has yet to experience for itself consequences of nationalism gone too far. Europe has had two devastating wars as a result of nationalism (gross oversimplification, but nationalism was definitely a major contributing factor). In contrast, the World Wars didn't damage the American homeland.