Stupid question about Horscrux!Harry

[pippin_999]

Eloise:
> The theory that Harry is a Horscrux seems to have widespread
support  and I can see its logic. What I don't understand is why, if
Voldemort  was unable to possess Harry,
> 
> "because he could not abide to reside in a body so full of the
force he  detests"
> 
> a part of his soul is able to survive in him.
> 
> I suppose that if that part of his soul is totally divorced from
him,  it may be that he is immune from the effects of that detested
force,  however, it still seems thematically odd to me that it is 
possible.
> 

Pippin:

If a piece of the soul is lost because murder tears away some of the
murderer's humanity, some of his  potential for goodness, then it
makes sense  that Voldemort's lost potential for good could find 
a home in Harry, and that Voldemort, who had alienated and rejected 
that part of himself, could not abide its presence, even though it
was once his. 

Of course the Diary doesn't work like that, it is full of evil intent.

But the Diary was an intentional horcrux, and Voldemort presumably
placed his intentions into the diary along with his fragment of soul.
But if Horcrux!Harry was unintentional, then perhaps he has
Voldemort's soul but not his intentions.

Pippin