God doesn't let bad things happen....people make bad things happen....why do some die and not others? Course of life....why do people do this stuff...that is the real question...Most "bad" things which happen do so because God gives a radical freedom to God's people; we are free people, not puppets on a string. But God does not cause "bad" things to happen. God loves us and grieves with us in our pain when "bad things" happen.
Therefore, we might best respond by saying that God does not Will "bad" things to happen in life. Rather, "bad" things happen in the freedom that comes with the gift of life. When "bad" things happen to any of God's children, God is grieved and suffers with us JMHO