Hi Buffybuff: You bring up an excellent point. I wondered about that too until I re-read the Prophecy.

If Dumbledore tries to kill Voldemort, Dumbledore will be unsuccessful. The Prophecy tells us so. Dumbledore on the other hand could die at the hands of Voldemort. Then who will be around to protect Harry? Dumbledore is wise enough to know that, in the magic world, you can defy the Prophecy but it will have severe consequences. That much we know.

What we don't know is if there is a Prophecy in the Department of Mysteries that pertains to Dumbledore. In any event, he is committed to Harry's life and not Voldemort's death.

What do you think?