That's my interpretation as well.
I think that in the model given by the Bible, ultimately, God's responsible. Personally, I don't feel any particular need to argue whether he knowingly allows people to act the way they do or whether he compels them to do it. Either way, God's culpable for what humans do.
How is this relevant? In the other thread, you were the one who suggested that belief in God is a comfort. Not that it's more of a comfort than atheism; that it's a comfort in its own right.
I think it's painfully obvious that sometimes things happen that aren't comforting. They're tragedies. They motivate us to make things better in the future.
Why would they believe that? I mean, are you sure that all the children who were killed in the Sandy Hook shooting were part of the "elect"? Are you sure that the shooter isn't?
What if God saw fit to send Adam Lanza to Heaven and the children to Hell? Given your theology, can you say for sure that this didn't happen?
I say that the morality of what you're doing depends on whether your beliefs are true. If you leave it up to God to comfort the afflicted and punish the evil, then if you're wrong, the afflicted go uncomforted and the evil go unpunished. I think it's much better to try to comfort the afflicted and punish evil as best we can in the here and now.