Because the identitarian worldview focus on cultural aspect understood in an organicist frame.

A sophisticated way to say, '' we are afraid to talk about race and genetics because people call us racist, so we talk about culture''

Frenchmen will prosper when the nation is mostly French or at least European who can assimilate easily into French culture. What hodgepodge of organicism is there to this? What's the cultural angle to taking in negroes? Does the rapes and arson not sting if they wear a wooden cross instead of a white hat?