Postmodernism says that there is no objective truth

 The worldview of postmodernism holds that there is no single, objective truth and that all knowledge and beliefs are relative and socially constructed. This perspective can have several problematic consequences:

1. It can lead to moral relativism, where there are no universal ethical principles and all moral beliefs are considered equally valid. This can undermine the ability to condemn egregious moral atrocities. [1][4]

2. It can foster skepticism about the reliability of science and the ability to make objective discoveries about the natural world. This can hamper progress in fields like medicine, technology, and environmental protection. [2][5]

3. It can contribute to the rejection of objective facts and the rise of "alternative facts" or "fake news," which can undermine public discourse and decision-making. [3][6]

4. It can make it difficult to establish shared cultural values and a common understanding of history, which can fragment society and hinder collective problem-solving. [1][4]

Overall, the denial of objective truth can lead to a breakdown of shared standards, the erosion of objective knowledge, and the undermining of important social, political, and scientific institutions. A healthy society requires at least some degree of shared reality and common ground.

In conclusion, the postmodernist denial of objective truth is a rejection of reality and reason. It leads to moral and epistemological chaos, undermines progress, and fragments society. A healthy and rational society requires adherence to the objective reality that guides human thought and action, ensuring the survival and flourishing of individuals as independent, rational beings. Any philosophy that denies this is inherently destructive and incompatible with human life.

Sources 

1 The Universe Next Door, 5th Edition, by James W. Sire 

2 The Legacy of John Lennon by David Noebel 

3 The Universe Next Door, 4th Edition, by James W. Sire 

4 Understanding The Times, Revised 2nd Edition by David Noebel 

5 The Politically Incorrect Guide to Islam (and the Crusades) by Robert Spencer 

6 Seven Theories Human Nature by Leslie Stevenson