The letter says: “We know that high inequality undermines all our social and environmental goals. It corrodes our politics, destroys trust, hamstrings our collective economic prosperity and weakens multilateralism. We also know that without a sharp reduction in inequality, the twin goals of ending poverty and preventing climate breakdown will be in clear conflict.”
Because in the long term, their interest is to give up as little as possible to maintain the status quo. They’re not actually interested in the harm that economic inequality causes to poor people, only in walking back from the harm a mass unrest event would potentially cause them.
If we’re needlessly overthinking, I must point out that by rejecting a call to reduce global inequality because you suspect it doesn’t go far enough…you’re siding with / helping the people who DON’T want to reduce global inequality.
That’s a fair criticism. I don’t really have a better answer to the situation at hand. I think it’s just important to keep in mind that this is why were in this situation to begin with.