[sprucevoid]

You say "childish" and "unrealistic" but such legal rights already exists. For example children have a right to education and the government has to see to it, in one way or other, that the child gets education (which could take the shape of public schools or funding, regulation and overseeing privately owned schools or some other arrangement). Similarly for other legal rights. a right in that sense means an especially strong claim that guides policy and is specified and updated through laws and regulations.