"Think of the children" is not an universal red herring, though. It can be used in bad ways and good ways, and a lot of ways in the middle. Child labor was banned because people started to think of the children.

Transition of minors does not seem to be a morally clear cut topic to me, given that they aren't allowed to do a lot of other life changing things. You can argue for the opposite, but too many trans activists are painting their opponents as stupid, disingenious or even hateful and want to silence them by force.

This will blow back on them.