It’s definitely not just an American thing.
“Under no pretext should arms and ammunition be surrendered; any attempt to disarm the workers must be frustrated, by force if necessary.” -Karl Marx
America codes have a “unique” culture around guns, but that’s not all that prevalent on the left. What’s driving interest in guns is the sad fact that we might need to use them.
The thought process that “we might need to use them” is evidence that the left in America does think about guns differently than the rest of the world.
You should mention that that was Karl Marx before the US civil war. Not Karl Marx in an age where drone-based warfare is common.