New Zealand’s new coalition government has announced it will repeal or review at least a dozen policies that provide for Māori, saying services should be provided on the basis of need, not race. But critics say the move is using fear to roll back decades of progress for Māori. On the eve of Waitangi Day, the Guardian’s New Zealand correspondent Eva Corlett and Prof Margaret Mutu from the University of Auckland explain why the government has chosen this moment for reform and how Māori are pushing back