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UPDATE 1-UN rights chief's tenure ends in disappointment for some China activists

* Wife of jailed activist disappointed in Bachelet

* Last-minute release of report on Xinjiang welcomed

* Tensions inherent in choice of her successor

* Autocracies seen gaining influence on human rights (Updates with China report, comment from Uyghur activist, Bachelet's office)

By Emma Farge

GENEVA, Sept 1 (Reuters) - Michelle Bachelet, once a political detainee under Chilean dictator Augusto Pinochet and a doctor for tortured children, pledged to be the champion of victims when she became U.N. High Commissioner for Human Rights in 2018.

But as her tenure ends this week, family members and advocates for those caught up in China's repression of dissent have said they feel let down despite the last-minute release of a report critical of China, and they are calling for a more outspoken successor.

"I feel terribly disappointed that our letter (to Bachelet) was totally disregarded and no follow up," said Luo Shengchun, the wife of jailed Chinese rights lawyer Ding Jiaxi, who wrote to Bachelet seeking his release in May, shortly before Bachelet visited China on a rare fact-finding tour.

"I wish for them to replace her with an officer with a more clear position with China. The UN can really do much more," she told Reuters from New York where she lives in voluntary exile awaiting the verdict of Ding's trial on state subversion charges.

Luo's comments reflect a widely held view among civil society and Western states that Bachelet, a former Chilean president, has been too soft on some governments when they are backsliding https://freedomhouse.org/article/new-report-global-decline-democracy-has-accelerated on human rights around the world.

However, they welcomed the release on her last day of a report on the Xinjiang region which said China's "arbitrary and discriminatory detention" of Uyghurs and other Muslims may constitute crimes against humanity.

"We are mostly disappointed and expected her to be firmer on China overall; however leaving with this report helps her office's credibility," said Zumretay Arkin, spokesperson for the World Uyghur Congress.

Bachelet had earlier said she has been under "tremendous pressure" both to publish and not to publish, with Beijing asking her to bury it.

China, which vigorously denies any allegations of wrongdoing in Xinjiang, wrote a 131-page response to the report, which its mission in Geneva described as a "farce". On Ding's case, China's foreign ministry said it is a country governed by the rule of law, and everyone is equal before the law.