Relying on evolution, a slow mechanism for humans, especially in a social context where a lot of selection pressure has been removed, sounds like really bad way

Relying on evolution, a slow mechanism for humans, especially in a social context where a lot of selection pressure has been removed, sounds like really bad way to design policies. Beyond the fact that you would need a direct link between genes and rationality for selection pressure to apply, you're positing that rational people have more reproductive success. Is that really true you think?