Do you believe nature doesn't make mistakes?

That disease is a good thing with some sort of positive end goal? That oily skin is natural and no need to correct it? That allergies are just part of nature and not a bad thing, not even if the allergy kills a person? That genetic mishaps like Downs Syndrome are natural and not abnormal? That cancer is just part of nature and not something to try and cure or eradicate? Is natural always ok? Nature never makes mistakes?

Feel free to give examples of where you think nature has screwed up. Or, if you think nature is always right, let us know that too.

Lastly, is nature synonomous with God for you? My Q is specifically about nature not God, but I am curious if you see them one and the same.