Good point. If a parent gave their kids methamphetamine we would probably expect the state to intervene in that case. It's violating the parents right to decide what's best for their child, but it's also clear that the parent is abusing that right and harming the child.
But also I think my state legislature is reacting to a problem that isn't really happening in my state. This is very conservative Idaho, not wacko leftist California. The two families in the state that want to gender transition their kid will just move across the state line to Washington.
They're more making a statement with this law than solving a problem that actually exists.