He tried that, in Eden
We believe it was a good thing they ate the fruit (metaphorically speaking) because without experience, they would have never known joy.
11 And Eve, his wife, heard all these things and was glad, saying: Were it not for our transgression we never should have had seed, and never should have known good and evil, and the joy of our redemption, and the eternal life which God giveth unto all the obedient.(Pearl of Great Price | Moses 5:11)
think about it, without the fall, there would be no real sacrifice, no real love... "love you enough to die for you" would not exist, love would be watered down / not real... all of it would not be real.