The Set Up (was Re: Pensieve memories again. Was: Harry's anger

[potioncat]

No: HPFGUIDX 122451


 
> Snow:
snip
 In other words this scene happens for a reason
and the reason
Snape 
allowed Harry to purposely  see himself place memories in the 
Pencieve is nothing more than a  test that both Snape and Dumbledore 
accurately assumed Harry would  fail at. This was a way to convey 
information to Harry without Harry  becoming suspicious as to why 
and ask too many questions over it. 
snip
Harry's viewing of this particular scene made him rethink his 
position on  Snape and question his own father. 

Potioncat:
So, the conversation goes like this?
DD: "Look, Sevvie, Minne and I have spent the last 5 years telling 
Harry how great his Dad was. We need to let him find out the truth."

SS: "It's OK, H.M. I've told him already."

DD: "But that's not good enough.  How about we let  him see a time 
that James embarrassed you for no reason?"

SS: "Was there a time for no reason? Oh, how about the time they 
flipped me upside down in front of everybody?"

DD: "Great! Just put that memory in the Pensieve each lesson until 
an emergency comes up, causing you to hurridly leave the room.  
Harry will be overcome with curiosity, and look in it."

SS: "Done! I can't wait!"

Please understand, that was tongue-in-cheek, not sarcastic. Well, I 
have no trouble believing JKR set the situation up.  But I can't 
understand why DD and Snape would. Can you explain it again? (Keep 
in mind I'm a bear of very little brain.)
Potioncat