Harry Potter Book 6
Do Not Read Unless You Know or Wanna Know
Wanna hear what I have to say?
Wanna know if I think Snape's Bad?
Snape TELLS Bellatrix and Narcissa he's evil and makes the vow.
He KILLS DD.
He calls Voldemort the Dark Lord, well who else uses that term, and he *really* freaks out when Harry dare sez his name.
In Book 1, he supposedly saves Harry and confronts Quirrel "whose side are you on?", but if he had suspected Quirrel, why did he not turn him into DD. DD seemed unaware that one of his teachers was after the stone.
In Book 3, he is quick to get Sirius back to the Dementers
In Book 5, he lures Harry with the memory and then does not teach him. Besides *seeing* him kill Dumbledore, this is the most convincing evidence that he's bad. Why leave that memory so handy for the curious Harry unless you wanted him to see it. If learning occulmancy was SO important, why push him away?
Finally, Snapes been an all 'round awful person in all the books.
DD has said time and time again, that he trusts Snape.
DD basically never argues. Why was he arguing with Snape. Perhaps because Snape did not want to do what DD wanted, like kill him.
He fixes a potion to heal DD after DD's hand get's fried from the ring horcrux. When DD drinks the potion in the lake, he WANTS Snape (presumably for another potion).
DD gives Snape the DADA position, knowing the holder only lasts one year. Where did he think Snape was gonna go after the year's position?
Snape tipped off the Order to the attack on Harry and the kidz in Book 5 (he sez he helped "get" Sirius, but I do not think the DE wanted a fight).
The events surrounding the tower attack are quite odd. If Snape has shown his true colors, why would he not be more rampant in his attacking? Flitwick does not remark that he was attacked by Snape, so it seems true that he did not attack Flitwick. Why would he just leave Herminione and others. Why would it appear that he is not attacking Harry but still teaching him at the end.
So, my general theory (which I actually had going into Book 6): Harry is gonna have to team up with all 4 houses to defeat Voldy. That has basically been the message from the sorting hat since book 4. Essentially there will be one big coalition of gobblins, elves, the 4 houses, the 3 schools--I think there will be something to do with the uniting that will be a powerful force. Now...
...what Snape was doing at the end was not scurrying Malfoy back to the dark lord, he was taking him to the witness protection program, so to speak. The whole set up in the tower was to save/redeem/convert Malfoy. And it worked. At the end of the day, he would not kill DD (and he felt bad about getting the werewolve in). I think the 7th book will start with Malfoy in hiding at Grimauld Place. Remember, DD told Malfoy he could be hidden in death. That's where DD is, hiden. In death.