Not a bad trick. Since each individual mutation (of which the vast majority are lethal)has no way of self-directing itself, nor determining it's individual outcome as being positive or negative to the species, we must conclude that either this was a "directed" natural selection or an accident, or never occurred.
Evolution is a theory. An unproven theory. There are other theories, and there may someday be additional theories as to how we came to exist as we are. I don't know the answer myself, but clearly evolution has holes in it big enough to drive logic through.
Name one.