The falseness stems from a rejection of any concept that morality is something that needs to be studied, learned and developed. When it automatically takes care of itself, it's not morality. A false concept about morality is that it can be determine by feel. Supposedly, that which feels right to self-righteous persons is morality. The problem with determining morality by feel is that sin feels good to corrupted persons.
Sin is developed through psychological conditioning with power as the positive reinforcement.
Positive reinforcements feel good regardless of whether they are constructive or destructive. Because sin can be made to feel good, satan's crew controls and corrupts gullible persons by entertaining them. One of the few things corrupted persons can do with their power is entertain people. So they set up schemes for entertainment including partying, drugs, alcohol and sexual sin. It's the primary occupation of corrupted persons.