Insider/Outsider... Again

After reading "Words of Jade and Coral: Latino Literature for Children and Adolescents" by Ada, I can't help but wonder if the entire subject of multicultural/diverse literature revolves around the insider/outsider debate. Ada herself admits that there are many books published about Latinos, but because they are not written by Latinos she chooses not to cover them in her article. Then in literally the next sentence she admits,
"The merit of a book is determined not by the heritage of the author or illustrator, but by their intention, knowledge, sensitivity, responsibility and artistry." (Ada, 37).
I understand that Ada then goes on to explain that she believes you cannot easily obtain the inner look to a culture, but I feel that she still contradicts herself. I feel that if she is going to complain about there being so few Latino authors, she must be more accepting of those who are trying to spread the Latino culture. I feel that she needs to accept these authors for who they are and their good intentions just as she wants to be accepted. I will be the first to admit that Latino literature seems to be severely lacking in the mainstream children books. The only books I can think of is "Esperanza Rising" and "Becoming Naomi Leon" both by Pam Munoz Ryan. This basically shows that there really are a low number of Latino authors. I would not know about these books if it were not for my TE literature classes. I can agree with Ada in this sense, but I also have to disagree when she does not look at authors who are not Latino. I believe that she must embrace all the authors who are trying to teach youth about Latino culture.