View: https://www.youtube.com/watch?v=p93w7MpbZRw
Possibly one of the most iconic scenes in cinema, also a very succinct argument for objective moral antirealism. If following a certain rule brought you to an undesirable result then perhaps said rule is false or your desired outcome is also false.
Think about marriage for example or finding unconditional love. If you are being told to grind, make a lot of money, study and then the girl will come to you and that doesn't happen then it means that following this pre laid path has been wrong. So you change it up. You roidmaxx, you stop your education, start acting like an antisocial thug and maybe, just maybe you will have some luck. What is certain though is the fact that you will not reach your desired results if you go by the rules.
