So some experimental data suggests that Asians are smarter than whites who are smarter than blacks, and Jews are smarter than everyone else. So what? America's Declaration of Independence proposes "all men are created equal", not because of their intelligence but because they are "endowed by their Creator with certain unalienable Rights". The rights to "Life, Liberty and the pursuit of Happiness" -- among others -- don't depend having a certain amount of intelligence, they depend solely on the endowment of God.
Wait, what's that? You don't believe in God, and you don't believe that our natural rights derive from him? Well then, what's your basis for blanket equality across the human race? If we're merely the product of evolutionary processes, they why should anyone stand in the way of those processes continuing and weeding out the branches of humanity that are "less fit" for our modern environment?