Sure, I certainly agree children should have ample access to mental health.
Thing is it doesnt work that way. Most people with mental illness will never be diagnosed, especially when they arent seeking it out. Even when someone thinks they have a mental illness it can take many sessions and back and forth and several failed diagnosis before you settle on some diagnosis. Now if someone is resisting the process, well there isnt much hope.
Its not about identifying and "flagging" the mentally ill, that is just adding a taboo. What we need to do is offer talk therapy (and access to medication if needed) to address their mental health issues and be healthier better members of society, regardless of if their mental health issues is tagged with a specific name or condition.