The effect isn't 'as though' it designs or plans at all, any more than clouds 'plan' to rain on the plains. Evolution is better described as 'survival of the fittest' than 'programmed to -foo-'. Keeping it phrased correctly also helps keep specious Intelligent Design arguments at bay - by talking about 'design' or 'programming', you're implying a sentient cause. And you don't actually need to say things like 'programmed by evolution' anyway. It's better to say 'resulting from evolution' or similar. Makes the same point, but keeps it correctly phrased.