Quite often local experts express their dissatisfaction with foreign experts commenting on their countries. Do they have the right?

To varying degrees, all human beings are biased. It's a humbling fact. Humans quite often systemically fail to process certain pieces of information. More on cognitive biases in these two superb books.

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In my opinion, when trying to understand something, you'd best talk to both local and foreign experts. Each offers a unique perspective that helps you see the picture more clearly.