We can't trust anyone...

[dysisgirl]

No: HPFGUIDX 78056

sophineclaire is right.  If you read through the books carefully, 
you'll notice that Ron makes up theories all the time, and they are 
constantly wrong.  But, when Ron jokes, his joke is usually on the 
right track.  Hermione's theories, on the other hand, are almost 
always right on.  I don't remember Hermione joking, so I can't say 
anything about her jokes.
What I'm trying to say, though, is that Hermione might be right in 
this passage.  If you can't trust DD, then you can trust nobody.  HP 
learns that he cannot fully trust DD.  Therefore, he can probably 
trust no one.  Maybe this suggests that Ron and Hermione will turn 
against Harry in a very important situation.

-Dysis