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Although her health may not be the biggest issue or barrier, but staying away from active office would afford her an increased opportunity of mentoring and raising up the next generation of defenders. This could be more productive for the country and its future than her in office. Achieving an office is obviously an easy thing but the reputation and standard she has set, far surpass an office.
Mr. Mandela of South Africa did the same, but his days as a president is rarely anything to celebrate, in comparison to his days as a humble Human Rights Defender and Activist.
Is selflessness being ignored by someone who has been extremely selfless even unto death? Some argue that these god-like activists proves a point that is symbolical by contesting and achieving political office; but could not going for that office be [even] more symbolical?
Of course, from a Rights point of view, Aung San Suu Kyi is eligible like anyone else to contest offices. And also even more because she has put in everything to make this moment come to fruition when every citizen of Burma can now contest offices in a democratic environment.