You left out the key world: "beneficial". God causes good to come out of everything but in general mistakes, errors and mutations are neutral or they are negative in nature. Not beneficial. Christians believe we live in a fallen world that is in need of a Redeemer and redemption. God is in control and He is going to restore this world to His plan and purpose. Science IE the theory of evolution does not taken the fallen condition of the world into consideration. God has everything under control. He dots every i and He crosses every t. There is nothing He leaves undone and unfinished and He leaves NOTHING to chance.
That is not at all accurate. Those of us who hold with theistic evolution do in fact take sin with sufficient seriousness, probably moreso than anti-evolutionary Christians. The further up the scale you are, the more complexity you have, and that means more freedom, and that means more opportunity for things to be used as not intended to be. If a piano only had one note, nobody could ever hit a wrong one. But with 88 keys, all sorts of noise, wrong notes, and so on can happen. God is continually providing us with new-found creative possibilities to actualize beauty, but its up to us to decide how well we will actualize them. Evil occurs because we made bad decisions. Anti-evolutionary Christianity goes strongly on the notion that God dictates or predestines absolutely everything, including the Fall. Hence, God is in fact the author of all evil. In turn , that means evil written off as merely apparent, as it all serves and represents God's will. Now, I don't know any approach that would take sin with less seriousness than this one.