Another observation I have is that there's little mention of the history of Xinjiang itself. The long-standing threat from Russian influence starting from before Republic of China (ROC) period. And the autonomous Muslim defense against russian puppet gov https://en.wikipedia.org/wiki/Islamic_rebellion_in_Xinjiang_... and even the later alliance with the communist party. Sure you could argue from one-side that all that is happening is wrong but unfortunately a lot of the evidence today are from anti-china alliance such as epoch times, which in my opinion really hides the real issues of the chinese society.
However I do agree with you, for the opposite it might well see han population as a threat, probably right from the early dynasties. I have by no means implied Russian influence is 'evil', it is simply the historical narrative. It is only natural that from 1900s the powers around that area want to take control in the geopolitics. Same situation today.
My point is that if you understand the situation better (which is hard because of language / culture barriers, similar to middle east crisis), you might be able to know more nuances of the issue.
The Chinese crackdown on Xinjiang goes back well beyond the terror attacks. There used to be a secular, non-violent Uighur movement for their rights, including Uighur communists who simply wanted the right to use their own language at all times and not Chinese, like the laws ostensibly allow. However, in the 1980s and 1990s the Beijing regime imprisoned many of those activists or sent them into exile. At the same time, Han settlers were entering the area even though it was clear that this would change the region’s demographics.
Once the secular and non-violent activism was shut down, there arose out of desperation new trends that were violent and/or Islamist. But that doesn’t mean the CCP’s policy of Uighur assimilation and Han settlement didn’t come first.