This thread is full of people saying things they wouldn't utter in real life, I don't see your point. I also don't believe Robinson's father immediately went to the authorities for prize money, he called in a pastor who (I assume) advised him the only sensible thing to do is to turn his son in and face justice. Especially if Robinson was truly expressing suicidal thoughts, which poses a more immediate threat than whatever torture awaits him in the penal system.
If you found out someone you loved committed some crime and immediately think "Hell yeah I would turn that cunt in", I don't know what to think about you.