Dubstepped: Is it to reinforce his beliefs and help him in some way?
That is exactly how an elder explained it to me many years ago. If a brother needed 'upbuilding' in a particular area the elders would assign him a part dealing with it. The idea was that he would be encouraged more than anyone since he would have to look up the information, run it through his head, and contemplate it.
Even as green as I was in the early 1970s I thought that was backward thinking, not to mention hypocritical. And as you mention it's often unfair to the person giving the information.
Dubstepped: Were they giving him talks on that subject matter thinking that he needed to learn that material and apply it, or are they just that stupid?
Yes and yes.