Even though I don't want to assume too much, I am going to assume that the editors of New Scientist, or at least many of their readers, lean metaphysically in the direction of naturalistic materialism. That is, I'm going to assume they hold to the view that nature is all there is and that all of nature is ultimately explicable solely in terms of matter and the laws which govern its behavior.
If I'm wrong in my assumption, I apologize at the outset.
But assuming that I'm correct I have a couple of questions for New Scientists' editors.
Doubtless they explain in the article what they mean by inequality, but whatever is meant by it, how do we know it's wrong? In order to know that X is wrong there must be some objective moral frame of reference to which we can compare X to see if it conforms to that standard. On naturalistic materialism, however, there are no objective moral reference frames, there are only subjective preferences and biases.
On naturalism when someone says, for example, that racism, murder, or political corruption are wrong all they're doing is emoting. They're saying something like, "I really don't like racism, murder or political corruption."
Moreover, inequality is the natural, expected outcome of the evolutionary process. Evolution by its very nature generates inequalities of all sorts. Why should anyone think that one evolutionary by-product, inequality among humans, is any more or less wrong than any other unless those by-products are being compared to some higher moral standard? How can we say that kindness is right and cruelty is wrong if both are simply the products of impersonal processes like random mutation and natural selection?
If our fondness for inequality is merely a product of evolution then to declare that it's wrong is a lot like declaring that our fondness for sweet tasting foods is wrong. Nothing that has resulted from a blind, impersonal process like evolution can be either right or wrong. It just is.
We like to think that the evolution of sympathy or kindness is good and the evolution of greed, racism and aggressiveness is bad, but how can we justify such an assessment if there's no higher standard to which we can compare these things? And on naturalism, of course, there is no higher moral standard. All there are, ultimately, are atoms jiggling in the void.