OFH, Life-debt and Snape/Lily-no-way

[antonia31h]

No: HPFGUIDX 162411

Sorry if my theories are again crazy but regarding Snape and his
loyalties I am totally confused because everything points out in the
book that he is in fact a spy for Dumbledore and then JKR says in all
her interviews that he is a jerk. I mean if Dumbledore trusts him
completely then this means for me that he is a good guy. Otherwise
Dumbledore is a far less skilled wizard than I thought and than we
were made to believe. C'mon he's supposed to be the only one Voldemort
has ever feared and he is not capable of recognising if Snape is a
traitor? 
My point is that there is a contradiction between what JKR wrote in
the book about Snape and what she's saying in interviews about him.
She definetly loathes him but still she makes Dumbledore trust him
completely. Like I said I think this discredits Dumbledore as a wizard.
Snape is loathsome and yet he has the trust of the best wizard? What
am I supposed to make out of this?
Again sorry for the rambling.