I think that we have to so weaken his infrastructure that, whether he is technically alive or not, he is so pinned down that he cannot function. My preference obviously would be to capture or kill him. But if we have so tightened the noose that he's in a cave somewhere and can't even communicate with his operatives, then we will meet our goal of protecting America.
That was when he wasn't attacking the Bush policies or working to overturn them. You know, the same ones that allowed us to kill bin Laden.