I have no problem with people interviewing them. It doesn't cost that much money to do so. The people who are interested in learning more about that particular group can interview and self-publish books. The government is there to help a society do important things to most or all of society that are impractical to do individually. (e.g. road or rail networks, national defense, space program, paying for retirement of workers, medical care in most places, etc). Interviewing 12 youths about their feelings about gender and writing about it is neither impractical to conduct with one person's time and funds, nor is it something that more than a small fraction of the people are asking for.