He is sane enough to try to appear sane which moves him from insane to psychopath.
He vetoed it because he literally is fearing for his life from California parents who would have given him the french revolution treatment:
Poll: 74% of California Voters Reject Children’s Transgender Medical Treatments
https://www.breitbart.com/politics/2020/09/07/poll-74-of-california-voters-reject-childrens-transgender-medical-treatments/
Drag Story Hour at the San Lorenzo Library met with protesters
https://www.ktvu.com/news/drag-story-hour-at-the-san-lorenzo-library-met-with-protesters
Temecula school board approves anti-LGBTQ flag policy
https://ktla.com/news/local-news/temecula-school-boards-proposed-flag-policy-prompts-concern-over-lgbtq-issues/
violence breaks out between parents and LGBTQ supporters at LA elementary school where Pride flag was burned
https://www.dailymail.co.uk/news/article-12153747/At-one-person-injured-violence-break-parents-LGBTQ-supporters.html