This policy is so so so important for transgender kids. Trans rights are humans rights and trans kids deserve to feel safe expressing their gender identity in their environment.
Why would you not care about trans kids? They are people too, are they not? Open your eyes and open your minds. To those that oppose, stop being bitter and being obsessive over children (who has no connection and nothing to do with you) and who they are. It's their lives. Not yours. Plus, you look odd caring so much about the business of youth. Are your own lives that boring that you feel the need to insert yourselves? Go and move out to a different state if this bugs you so much. Transphobes aren't welcome here anyways.
It is also backed up by psychology that kids are able to understand their gender identity from a young age :)