Snape definitely good

[klodiana_xha]

No: HPFGUIDX 137584

I am sure that Snape is not on the side of evil. The hatred and
revulsion seen on his features when he AK-ed DD could be easily
explained as how he was feeling about killing him. Go back to the cave
and read about the revulsion Harry felt towards himself for making DD
drink. 
I think, and feel free to tear my theory apart, that he went
definitely on  the good side cause he loved Lilly and he felt
responsible for her death.

Klodiana