I have finally finished my ultimate 'proof Snape is on our side' essay!
I beg you to read it...you know, unless you don't care, or you already KNOW Snape is on our side, in which case......well there are pretty graphics! And everyone loves a picture book! :)
Severus Snape: Dumbledore's Man at Heart
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So Dumbledore's reason for trusting Snape may be a bit awkward by our standards, but the part about showing remorse appears twice in the book, and it works in my favor. You see, Dumbledore says that Snape showed remorse after Voldemort decided to kill the Potters, obviously before Voldemorts downfall. And yet..Snape tells Bellatrix that:
"I spun him a tale of deepest remorse when I joined his staff, fresh from my Death Eater days."
He applied for the job AFTER Voldemorts downfall.
In short, Snape turned to Dumbledore prior to the Lord's downfall, but did not make it known to any of his Death Eater buddies until after, making it seem as though he was just using Dumbledore's trusting nature for protection. If Snape was really a Death Eater, he would have mentioned spying on Dumbledore during that time period in order to persuade Bellatrix he was to be trusted. ]
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