The fact that the shooter probably knew he’d be shot by the cops brings to mind the sort of thing that might have happened during the Cold War. The ideology might kill even if he will be killed to protect his “cell.” I’d say it was either crazy behavior, or ideology. Since there are others involved and apparently a lot of money, I’d tend towards ideology.
The Uyghurs are currently being genocided by China. So this is a VERY strange relationship.
My guess is money was missing.... .....