It's a good question. The writer is an American whose parents emigrated from Afghanistan, so he writes with a western audience in mind (his books are known in France as well). Of course he knows that there is an audience for such stories in the west, and the view of an immigrant who had to leave his motherland in a civil war situation is not the same as that of somebody who still lives there.
I do not know whether such a book could have been written by somebody who had not lived in the west for quite a while, but I doubt it.
Yet I don't think Khaled Hosseini wrote his novels in order to pander to the tastes of the west (in case this is what is meant but the original question asked at bookbuzz) about reading shocking stories about veiled Muslim women.
I've read interviews of Khaled Hosseini and he comes across as an interesting mind and somebody who genuinely loves Afghanistan and its people, and although Splendid Suns
is often realistic I never felt it was written in a sensational fashion.