Are you referring to lives taken by God or lives taken by others? If the former, I think it's important to be fair when "judging" the God of the Bible. If we're talking about the God of the Bible, then we're talking about God as He is described BY the Bible. And that means a God who is (among other things) all-knowing, meaning He knows the actions and thoughts of everyone -- even their potential actions and thoughts. With that in mind, can a human being ever say God is unjustified in choosing to take someone out of this world?