Because they’re fed lies and projection that those people are coming to ruin their way of life. And it’s very hard to undo all of that reinforcement, a lot of dissonance and regret and introspection to navigate if they do along with all the inevitable lifestyle change required to leave that environment. That’s why even the ones who admit they made a bad call, will usually only cite the consequences to themselves and their family. If they ever come around to actual stranger empathy it will be at least another year or two later.