Reason Dumbledore trusted Snape

[Inge]

No: HPFGUIDX 171695

Pippin:

<<< Me, I wonder if  the trigger for Snape's defection wasn't 
Voldemort's choice of the half-blood Harry instead of the pureblood 
Neville.>>>

va32h:
<<<I have a hard time imagining Snape defecting over the pureblood 
issue since 1) Snape is a half-blood himself>>>


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Inge now:

I dont get the *Half-blood, Pure-blood*

Snape is a 'half-blood' because one of his parents is a witch and 
the other is a muggle.

So why exactly is Harry described a 'half-blood', too - when (just 
like Neville, who is a 'pure-blood') both of his parents are 
wizard/witch ??

The way I see it, Harry is as much a 'pure-blood' as Neville is.