Many adults desist and detransition so why wouldn't children, if left to develop normally? The problem with blocking these dysphoric childrens' puberty, putting them on cross-sex hormones and, in some cases, surgically removing body parts, is that they're never given a chance to explore how they would feel as fully developed adults.

Even referring to them as "trans children" comes with the assumption that this is some inherent and unchanging quality rather than a temporary state. Why assume this without evidence?