johannesburg retire south african cleric anti-apartheid campaigner archbishop desmond tutu urge myanmar leader fellow nobel laureate aung san suu kyi thursday intervene help rohingya muslims flee country western critics accuse suu kyi speak rohingya flee neighbor bangladesh follow army counter-offensive militant attack tutu say open letter suu kyi elderly decrepit formally retire break vow remain silent public affairs profound sadness plight muslim minority country rohingya dear sister political price ascension high office myanmar silence price surely steep ... pray speak justice human right unity people pray intervene tutu write tutu 85 live prostate cancer nearly two decades largely withdraw public life rohingya comprise 1.1 million people long complain persecution see many buddhist-majority myanmar illegal migrants bangladesh take care citizens take care everybody country whether citizens suu kyi say early thursday comment reuters television indian partner asian news international suu kyi nobel peace prize 1991 champion democracy refer specifically exodus minority rohingya south africa 's tutu ask myanmar 's suu kyi help rohingya