The point is not whether or not it makes sense. The point is that it is fairly natural for a capitalist system to have r>g and that causes concentration of wealth. If you look historically the increasing concentration of wealth only really gets reversed by wars or revolutions. So what Piketty is arguing for is a more gentle way of redistributing wealth, because typically when one gets to 1914 levels of inequality, well… we know what happens.

> because typically when one gets to 1914 levels of inequality, well… we know what happens.

When it comes to resource sequestration this is a fundamental law of nature. There's no safety in a world where random people on the street see your death as a biological imperative.