Marston on Natural Evil
“However, while the thesis that fallen angels are responsible for natural evil is not clearly false, neither is it clearly true.  There is no positive evidence that such beings exist and an argument based on their existence cannot be highly cogent.  If the possibility that natural evils stem from the free choice of an agent other than man is disregarded on these grounds, then neither man nor a free willed agent other than man can be held accountable for natural evil.  Therefore, the theist must attribute natural evil to the direct action of God.”