This is all wrong.
As long as the minor has US citizenship (through naturalization, parents, ect) they have citizenship. We can see this with ICE deporting non US citizen minors (there might be a rare exceptiom, but those are outliers).
Minors have constitutional rights as they have been ruled by the US supreme court to protest politically in schools (as long as it doesn't interfer with school operation or other students). They even have the ability for the second amendment as long as they are provided permission from the parent and is under adult supervision (hunting, target practice, compitition). Also still protected against unconstitutional searches or seizures.
Minors are not wards of the state unless they are sentenced to a correctional facility, some kind of state mental hospital, or orphinege. Children are under control of their parents unless some substantial reason (parent or guardian death, judification, extreme mental health).
As the other poster stated, children have protections such ad labor laws, protections against military service, protections against adult criminal trials (unless ruled by a judge).
(some of this will vary state by state, but most is the same)
That would be saying gun companies should be sued because they use guns in wars.