Building on an essay by Robert Nozick, here is Julian Sanchez:
If the best solutions to social problems are generally governmental or political, then in a democratic society, doing the work of a wordsmith intellectual is a way of making an essential contribution to addressing those problems. If the best solutions are generally private, then this is true to a far lesser extent: The most important ways of doing one’s civic duty, in this case, are more likely to encompass more direct forms of participation, like donating money, volunteering, working on technological or medical innovations that improve quality of life, and various kinds of socially conscious entrepreneurial activity.
You might, therefore, expect a natural selection effect: Those who feel strongly morally motivated to contribute to the amelioration of social ills will naturally gravitate toward careers that reflect their view about how this is best achieved. The choice of a career as a wordsmith intellectual may, in itself, be the result of a prior belief that social problems are best addressed via mechanisms that are most dependent on public advocacy, argument and persuasion—which is to say, political mechanisms.
…If the world is primarily made better through private action, then the most morally praiseworthy course available to a highly intelligent person of moderate material tastes might be to pursue a far less inherently interesting career in business or finance, live a middle-class lifestyle, and devote one’s wealth to various good causes. In this scenario, after all, the intellectual who could make millions for charity as a financier or high-powered attorney, but prefers to take his compensation in the form of leisure time and interesting work, is not obviously morally better than the actual financier or attorney who uses his monetary compensation to purchase material pleasures.