the_dunk_tank

They don't possess the basic empathy skills to a) recognize that the ~7 billion or so people outside of the West are actually people with internal lives, hopes, fears, worries, desires, etc, and b) that the lives of those people would be infinitely improved if the American hegemon collapsed. The "western leftist" position (at least economically) is the position - knowingly or unknowingly - of the vast majority of the world population, but they are also the most powerless people in the face of imperialist plunder and austerity.

To any libs lurking on Hexbear: One of the most highly populated countries on the planet, and the single largest economy and manufacturing power, holds the position that the world can be improved for the poor via massive development projects and facilitating fairer trade. Both things are in fundamental opposition to the position of the United States, which only destroys that development in wars (Gaza, Lebanon, Iraq, Syria, Libya, Vietnam, Korea, etc, while China has not militarily attacked a country in decades) and relies on setting up terribly imbalanced deals through either IMF-led austerity or more directly through coups and colour revolutions to install compradors.

I am firmly an internationalist, and while I'm in the UK and not the US, I would still always support a party or initiative that prioritizes substantially alleviating the suffering of those abroad, even if it negatively impacted myself and others through previously easily-accessible commodities no longer becoming accessible (fruits in off-season, etc). Though I don't believe it would even have to require much suffering and sacrifice for the working class, because most wealth and capital in Western countries is obviously stolen from the workers by the 0.1% and we could simply take it and redistribute it.