Science wants the fruits of science, and it does not tolerate much doubt about the goodness of those fruits. ... Scientists had a bad conscience abou… - Harvey Mansfield

Self-interest, when simple, is universal; I would do the same as you. I would be propelled toward an obvious good, or toward a good I thought obvious. If self-interest is obvious, it is not really your very own; it has been generalized, perhaps artificially.

The simplified notion of self-interest used by our political and social science cannot tolerate the tension between one’s own and the good, for that tension leaves human behavior unpredictable. One cannot penetrate into every individual’s private thoughts, and there is no clear way to judge among different conceptions of the good. So in order to overcome the tension, science tries to combine one’s own and the good in such a way as to preserve neither. It generalizes one’s own as the interest of an average or, better to say, predictable individual who lives his life quantifiably so as to make its study easier for the social scientist. And for the same purpose it vulgarizes the good by eliminating the high and the mighty in our souls (not to mention the low and vicious), transforming our aspiration to nobility and truth into personal preferences of whose value science is incognizant, to which it is indifferent.

The self is a simplification of the notion of soul, created to serve the purposes of the modern sciences of psychology and economics, both of which want you to be happy in a simple, straightforward way they can count.