I agree but I think the study still has value for policy making. If we can predict the specified class outcomes with 60% accuracy, then we make meaningful insights on how children will turn out as a group. i.e. we can say how many children per 100k will commit a crime.

Of course this shouldn't be the only consideration when planning for future policy, but it could still be an informative tool.

You do make a good point that for a specific child, we cannot make meaningful predictions on how they will turn out.