Using the parlance of the online right, they see the rest of the world (or allies anyway) as "NPCs"... And they are so blinded by their arrogance that they have not understood that other nations have pride and will defend themselves when attacked.
In the context of this trade war, I'd argue that the unity of Canadians and Mexicans, having been attacked, has always been an underrated factor. Pushing back is a 85+% issue for their leaders, whereas for Trump, most Americans don't even support these tariffs.