Income Inequality or Systematic Injustice as the Real Problem?

Will Wilkinson has a new paper out about just this. He argues that:

When injustice or wrongdoing increases income inequality, the problem is the original malign cause, not the resulting inequality. Many thinkers mistake national populations for "society" and thereby obscure the real story about the effects of trade and immigration on welfare, equality, and justice. There is little evidence that high levels of income inequality lead down a slippery slope to the destruction of democracy and rule by the rich. The unequal political voice of the poor can be addressed only through policies that actually work to fight poverty and improve education. Income inequality is a dangerous distraction from the real problems: poverty, lack of economic opportunity, and systemic injustice.