While people in the Imperial core do benefit from imperialism to the extent that it makes them unrevolutionary, it doesn't mean that making them worse off will make it any better outside the core.
Increasing income inequality in America doesn't make third-world countries any less exploited. It just means more of their labour is going to the American bourgeoisie rather than the American worker. The only argument you can really make is American workers should be worse off because they benefit from exploitation. But that's not a Marxist position, that's a moral position. It's a position that only seeks to punish people.
Regardless of whether American workers unfairly benefit from imperialism, I don't like when children go hungry, I don't like when LGBTQ+ folks are attacked, and I don't like when people die because they can't afford medication. Fighting for these things in America will not stop nor make worse the exploitation of the third-world.
I'm not an expert in psychology, but straight up denying reality has to be a worse strategy than just admitting Biden is senile.