We can talk meaningfully about collectives without necessarily having spokespeople or strict hierarchies within that collective (my current research is actually on collective responsibility for such large, disorganised groups!). And in the case of what is or isn't acceptable in the representation of a culture, people who are specifically well-versed in a culture's history and practices would definitely know better than you or me when it comes to judging the appropriateness of a given work. It's the whole reason why the job position of sensitivty reader exists.