If coming clean is a step toward remorse, Myanmar’s military deserves praise for a rare moment of honesty. On Jan. 10, it admitted its forces murdered 10 Rohingya Muslims last September and buried them in a mass grave. This bit of truth could be aimed at containing international concerns over the ethnic cleansing campaign. Yet it might serve as an opening to uncover and end one of the world’s worst rights-abuse cases. The military has driven more than 650,000 Rohingya into Bangladesh, and is accused of killing more than 6,000.  US Secretary of State Rex Tillerson has warned “The world can’t just stand idly by.” Rights groups want to involve the International Criminal Court. Myanmar’s military has had to relinquish dictatorial powers, but grants little authority over the Rohingya issue to Myanmar's de facto leader, Aung San Suu Kyi. But diplomatic isolation and economic sanctions are pinching. Easing generals from power must be done skillfully. One tactic is to encourage admission of wrongs, which could lead to a path of ending civil violence.