The naturalistic fallacy is more often committed by capitalist ideologues in my opinion. Most infamously through the application of social darwinism . Capitalist ideology tries to reify its brutal inequalities by framing them as the consequences of a law of nature (to the victor goes the spoils) and constructs the economy as a bloodsport of competing interests selfishly seeking to overcome their business rivals. Thus the underclass deserves their immiseration, as they are simply unworthy of a decent life or prosperity. Obviously this is all lies, and a way to mask and rationalize the exploitation on which capitalism is founded.
While morality and a sense of justice does play a role in socialist thought, it prefer to think of it more in line with the utilitarian school of thought. It is logical for the majority of humanity to to emancipate themselves from indentured servitude, usury, and systematized, legalized theft. And in the long term, it is in humanity's interest to form a more rationally organized economy that is based on social need rather than the chaotic and fickle whims of markets. So it is not about what "ought" to be the case, but what is most in line with rationality and prudent engineering. It's primarily a technocratic perspective.