Ah, that you see is the challenge of Stoicism. A Stoic does not believe that there is anything evil in nature, impersonal perhaps, but not bad. There is nothing evil about death, earthquakes, viruses or asteroids. They just do their thing and sometimes happen to go against human interests. This does not make them evil.
This is a difficult way to think at first, but it makes sense to me. Stand out under the stars and look up. Take a look at the Hubble Ultra Deep Field (http://en.wikipedia.org/wiki/Hubble_Ultra_Deep_Field). The universe is just so much bigger than me, so much bigger than my species. Why would I be surprised that it does not always operate directly in my interests?
Think about an ant in a busy railway station. If she gets trod on, does that make the commuter evil, or just indifferent to the ant's interests?
That is one of the lessons I have learned from observing nature. The complete absence of self pity, ruthlessly so.
The short poem 'Self Pity' by DH Lawrence illustrates this well:
"I never saw a wild thing
sorry for itself.
A small bird will drop frozen dead from a bough
without ever having felt sorry for itself."