Well he wanted to do the Imperius Curse so that they could not be caught.
He wanted to do the Cruciatus Curse to uphold the honor of someone who he holds with great respect.
But by the time he gets to Voldemort, he has already had a greater understanding.
I know I'm kind of grasping straws, but by the time he faces Voldemort for their final showdown, he's already had his talk with Dumbledore. While he wants to get rid of Voldemort, but he changed from the time he used the previous two.
Bullet Tooth Tony: You should never underestimate the predictability of stupidity.
Reporter on Titan Maximum: Sasha is there any connection between your poor album sales and the fact that it sucked?