If someone is in the dark they do not know anything but the dark. The others in the dark will be their teachers. They will believe things to be true in a way that it really is not.
If a child grows up in a house of drug addicts, drugs would be all this knows. The child would be taught about the drugs from the addicts. This child would believe that using drugs was okay and become an addict them self.
The ones in the dark will only believe what they think the truth is. If one of them is let free and introduced to the actual truth the one free will have trouble accepting it. They will need time to handle the "light .
If the child gores away to school and attends a Drug Abuse Resistance Education program confusion would set in. All that was believed and taught to the child earlier would now be challenged. Not knowing what to truly believe, time would be needed for the truth to be accepted and set in gradually.
In time they will accept that what they thought was real was really an illusion. In the light they are happy. They will feel bad for those in the dark who are not enlightened.
When the child is clean from drugs the truth that drugs are bad will be accepted by the child. This child would begin to see clearer. This child would feel sad for the others back home who do not know the truth and happy for them self.
If brought back to the cave they will fight the entrapment and fight for their freedom. They know how it is to be free in the light and do not want to be put back to be imprisoned in the dark. They know the truth now, but when they try to enlighten the others they are though of as mad.
If the child was told that they must go back home for school break the child would not want to go. This child now knows how it is to live freely without drugs and so does not want to go back the imprisoned life drugs kept him in back home. When the child goes back home the light with them and it will