snape's true colors

***spoiler alert for hp book 6***
i've been compiling my thoughts recently and what came out was so succinct and compact that i wanted to put it somewhere. i'm not sure how many questions it answers and it may only spark more. here goes...

q: was snape under the imperius curse?
a: while Snape being under the imperius curse is something i hadn't thought of, i think it is too late in the series for jkr to be bluffing with something like that. i think we have to accept that he did it, but we can debate on why he did it. the hp community is pretty much split 50-50 (or at least it makes it easier to say we
are) on whether snape is good or bad. if he was truly a double agent for LV all along, it fulfills AD's quote about "when i'm wrong i'm usually WAY (fatally?) wrong".

if he is still good - hard to believe, but travel with me - it could explain why AD seemed to be begging for snape to kill him (could be interpreted as AD begging to not be killed, but the overwhelming sense is that AD would never beg like that. also remember his quote that "death is not something to be feared for it is only the next great adventure") and why it seemed that snape was protecting HP from the other death eaters and giving him one last occlumency and dueling lesson ("keep your mind and your mouth shut") as he runs away. AD had 100% faith that snape was honestly good for some reason (that we assume we'll finally find out in book 7 via AD's portrait or something). if snape was killing AD on AD's orders, it could have been to continue to let snape stay as a spy on LV (though he will have no one to report to since the order assumes he showed his true colors). or it could have been to save both draco and snape's life because if draco couldn't fulfill his duty (his lowering of his wand says as much) and snape didn't fulfill the unbreakable vow, we should assume both would have died. and as for the look of hatred on snape's face, it could easily been out of self-hatred at having to kill the only man who ever trusted him (and who wasn't purely self-motivated, e.g. LV).