To the Editor:...In fact, the United States government should be commended for its leadership in trying to regulate “conflict minerals” and to starve rebels of the resources and weapons they need to kill and rape...The “conflict mineral” provisions of the Dodd-Frank financial reform law, which put the burden on companies to know and disclose the source of their supply, are a small but vital step in shifting the incentives away from the warlords...David Aronson’s attack on the Dodd-Frank law’s provisions on “conflict minerals” does not tell the full story...As a Congolese civil-society advocate, I have seen how the Dodd-Frank legislation on “conflict minerals” provides “the leverage needed to instill and impose ethical minerals business practices,” according to a coalition of Congolese human-rights groups.