1. Compare and contrast the Jasper/Alice meeting and subsequent love with that of Bella and Edward. Is one destiny and the other choice?
I believe that the meeting of Alice and Jasper was destiny. As Alice said, her first memory was of seeing Jasper's face, and knowing he would be in her future. We know that she sees outcomes of decisions, but we don't really see whether she made a decision that prompted this vision or not. This leads me to think destiny.
As for Bella and Edward, I believe it was more of a choice. Recall that back in Twilight, Edward wanted to kill her, and did everything he could to avoid that outcome. He then realizes he's falling for Bella, and starts acting out on this realization. On the other hand, Bella starts out extremely curious about him, which turns into infatuation. She didn't love him at first sight (murderous glare and all), but falls for him later.
2. Do you think it’s odd that Jasper has a tone of reverence in his voice when he speaks of the Volturi?
Knowing his history, no. If it weren't for the Volturi, things would have been so much worse- for vampires and humans alike. Remember that he was a soldier, and brought up to respect authority. The Volturi are the very definition of authority in their world.
3. Do you feel that sometimes people in a powerful position have to make hard and ruthless decisions for the “greater” good?
Without a doubt, yes. This question just asks whether they have to make such decisions, not if those decisions are good or not.
4. Discuss Carlisle’s loyalty to the Denali clan, versus his loyalty to the wolves.
I believe Carlisle thinks of the clan in Denali as extended family. If I recall correctly, Edward tells Bella that they (the clan in Denali) are the only ones other than the Cullens who live as they do- "vegetarians" as they call themselves. On the other hand, Carlisle did broker the deal with the werewolves eighty-odd years ago, and I see no reason for him to want to go back on that deal. He had to make a difficult choice when he learned about the fallout from Laurent's death; ultimately, I think it was loyalty to his family that made him side with the wolves. If he had let Irina have her way, the truce with the werewolves would be broken, and that would put the Cullens in danger.