I think it's more that for every thinker of the Right you have several degenerates like De Sade (incredibly degenerate even for our time) or Foucault, or people whose views enable degeneracy even if they were personally relatively normal, like Rousseau and Voltaire. Both of whom the last King claimed destroyed France through their inspiring of Robespierre and other revolutionaries. This then leads people to believe that Leftists are more intelligent or something along these lines. Of course this discounts that many of these "Left" thinkers are far-right today, like Proudhon. It also discounts how many Leftist thinkers are charlatans. Althusser, for example, wrote a book about Marx's Capital, but confessed late in life to only reading Marx's early works, and may have never read Kant or Aristotle, despite lecturing about them.

People like Comte and Le Play also belong in the Philosophy section, since Sociology was part of Philosophy for many decades after its foundation. Sociology was incredibly conservative until the 1890s or so when liberals like Spencer and Ward came to be its leading figures. German sociology remained largely this way till the postwar period.