Stupid question about Horscrux!Harry

[eloise_herisson]

May I ask a really stupid question?

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.

~Eloise