There is no reason why the abstract basics of any subject should not be developed in the secular world. But they are shunned or opposed. Corrupted persons oppose abstract realities because they cannot understand them, and basic truth evolves out of them. Having a reactive disdain for abstract basics, corrupted persons assume that there is something corrupted about dealing with such subjects. It can be stated as a truism that corrupted persons cannot understand abstract realities, because corruption is directly caused by and correlates with an inability to understand abstract reality.
Morality is abstract.
Persons who cannot understand abstract reality do not realize what they do to themselves through sin. When the consequences become visible to them, the sin ends. So there is a driving force in the world to put all realities and concerns in the most nonbasic terms possible, which means time, place, event, persons, structures and objects. With the basics of all subjects being undeveloped, the truth gets illusive, and propaganda is exploited. Nothing can be proven, and expertise becomes the basis for truth rather than logic applied to the evidence.