Barty Jr's motivation.....

[Hagrid]

No: HPFGUIDX 155970

> "sugaranddixie1" wrote:
> >
> > ...in teaching Harry's class about the unforgivable curses?   
> > The only conclusion I can come to is that he thought that was 
> > what the "real" Moody would do & so did it to make his   
> > masquerade more convincing.Maybe he never heard the 
> > saying , "Forewarned is forearmed".  Did Voldmort order Barty Jr. 
> > to show Harry the curses so he (Barty Jr.) could report back to LV 
> > with Harry's reactions?  Did he think Harry's advance knowledge 
> > would somehow cause him to freeze up with fear when the showdown 
> > took place?  Any thoughts?
> 
> Pippin:
> Even if Harry only  believed he had successfully resisted imperius,
> before, he might still have done it  'again', as with the patronus 
> spell.

aussie:
Three reasons I can think of: 

- It had been some time since Barty got the chance to have a wand in 
his hand. Apart from the imperius on his dad, Barty hasn't been able 
to use any unforgiveables since entering Azkaban. Now where better 
than a Dark Arts class.

- Tom wanted to teach Dark Arts himself. Any dark wizard getting into 
that role would want to include Unforgiveables to the curriculum. Once 
LV takes over, Hogwarts would get a very different teaching mentality. 
("Class, put your Horcrux text books away. Parsel tongue lessons 
starting now.")

- Another thing a dark wizard would want, is to look out for new 
recruits. Who shows a natural talent for Unforgivables? Who has a 
higher tollerance of pain? Who can torture a spider and not feel 
remorse?

The twins saw it in their class too. I don't think Barty Jr was 
teaching Unforgivables exclusively to Harry's class.