It may be that you have been ethnically planted recently, or it may be that you are afraid of being planted by others recently, and there is no necessary connection with Xinjiang people. It's just a carrier. Next thing you know, you escaped, but the victim who didn't escape made you sad. It is possible that you have inadvertently experienced similar emotions recently, and the mood in your dream has reappeared.
Because there is no reference to your living conditions, I can only guess, hoping to help you. If not, you can continue to think in a similar way. Dreams are usually the embodiment of an emotion that has happened. It's okay. Relax. . .