By dressing up U.S. imperialism in clothing that appealed to the sartorial preferences of the non-Communist left, the overt hand of U.S. imperialism was concealed behind honeyed phrases. Social democrats didn’t see imperialism; they saw humanitarian intervention, democracy promotion and the responsibility to protect vulnerable populations. Anarchists and Trotskyites didn’t see U.S. efforts to dominate other countries on Wall Street’s behalf; they saw the fight against tyrants, dictators and Stalinists.
Stephen Gowans, "U.S. imperialism: hidden in plain sight." what's left.