That’s actually the surprising bit here: in this particular consulting engagement the McKinsey guys appear to have correctly grasped what the client wanted and then implemented a straightforward and(when judged by those metrics) effective solution.
Receiving a straightforward implementation of what you want, without baroque complications or a profoundly broken project management disaster, seems a little out of character. Not because I’d expect them to have more spine about human rights; but because providing straightforward answers like “reduce costs by feeding them less” isn’t how you maintain the mystique of being an esoteric and high powered expert.