Insider/Outsider debate... Who should write about different cultures?

In regards to the "Insider/Outsider debate", I personally feel that people from specific cultures should write about the ones they belong to and people who haven't grown up with the culture should consult people who have. I feel that sometimes writers give themselves more credit than they deserve when it comes to writing about a culture they have not been raised in. For instance, sometimes people in a specific culture view an issue differently than someone who hasn't been raised in that culture. Even if the "outsider" completely immersed themselves in that culture, they may not know how people in that culture feel about that topic or how they would react in certain situations. The "outsider" would only be able to share that mentality if he was raised with the culture's influence. Some cultures on occasion keep certain things secret from "outsiders" to preserve their cultures and groups. Therefore, even though "outsiders" feel like they know enough about that culture to write about it, they may be missing out on some key information that only people raised in that culture would know. I think that "insiders" should write about their cultures instead of people who may have done a lot of research, but don't necessarily know specific things about the culture that only people who have been raised in that culture would know.