What if, not all but quite a bit of, the missing children who are around four to six years old aren't kidnapped by pedophiles or murderers, but by a government ran school.
They find a child who is all alone and take them to a school where they will learn to be spies. By the time they finish their fifth year, the child already knows basic algebra. When they finish their seventh year, they are allowed to choose what kind of courses they would like to go into (Fighting, repairing, programming, hacking, teacher, etc.) and finished learning the basic things we learn in school. After thirteen years at the school, they graduate and are given a tas