People under 18 are easily influenced by trends and social media, their friends and other media content

While there are definitely cases where the individual should be allowed gender transition treatment, the risk of allowing readily accessible treatment for anyone with temporary gender dysphoria to permanently ruin their lives is too great. You also have parents and teachers with their own agendas to confuse and convert children to non-binary or transgender and they should not be given the opportunity to trick children into taking life-altering treatments