A 2017 study titled A Genetic Basis of Economic Egalitarianism seems to have concluded that:
We use Minnesota Twin Study data from 2008, collected from samples of monozygotic and dizygotic twin pairs (n = 573) in order to estimate the additive genetic, shared environmental, and unique environmental components of social justice attitudes. Our results show that the large portion of the variance in a four-item economic egalitarianism scale can be attributed to genetic factor. At the same time, shared environment, as a socializing factor, has no significant effect.
Is this finding largely undisputed and/or corroborated by other studies? (Basically, somewhat simplifying, are would-be egalitarians simply born that way?)