Because it denies humanity their most basic right, that is, to free thought and the application of that thought to benefit everyone.

As genuine new paradigms resolve the anomalies of the current one, advance knowledge and workability and benefit everyone because it changes the realities of the entire pattern/system/body of knowledge under analysis, denying a new paradigm affirms philosophical and temporal universe monopoly.

We would never have had The Reformation or The Copernican Cosmological paradigm changes.