If "superintelligence" is such a big deal, how is it that e.g. MENSA members haven't taken over the world yet? Is there evidence of the assumed "superintelligen

If "superintelligence" is such a big deal, how is it that e.g. MENSA members haven't taken over the world yet? Is there evidence of the assumed "superintelligence/dominance" equivalence in existing human population data?