Right but his point is that those things are problems because they suck in absolute terms, not relative ones. Turning the whole world into a Syria-esque battle

Right but his point is that those things are problems because they suck in absolute terms, not relative ones. Turning the whole world into a Syria-esque battlefield should not be considered a success, despite the fact that it would lower inequality. Similar, if the mechanisms that eliminate guinea-worm come so at the cost of improving other people's lives even more than the Guineans, we should not oppose that even though it increases inequality. What matters is our absolute quality of life rather than our relative one, and as such inequality is not the metric we should use to identify problems.