There's no evidence that Uighurs are a security threat to China. This is number one. If Uighurs are a security threat for China, then how about the scholars? Even the senior-level government official who served as the top energy minister, whose name is Nur Bekri, is under investigation. On July 5, 2009, during the Urumqi massacre, Nur Bekri was the governor of the Uighur Autonomous Region. So China is not discriminating depending on whether you are security threat or not. China is always trumping up charges. Before 9/11 it was separatism. After 9/11 it was terrorism. Now it is vocational training.
If there is a security threat, the Chinese government should tell us what it is.