Why did Hilary Putnam criticize the traditional distinction between facts and values?

Hilary Putnam criticized the traditional fact-value distinction—the idea that there is a strict separation between factual descriptions of what is and normative judgments of what ought to be—by arguing that the two are inextricably linked in human language.1

Putnam contended that many expressions, such as "cruel behavior" or "smart move," contain a factual-descriptive component that cannot be disentangled from their value-laden nature. Because human language is inherently both factual and value-laden, he rejected the notion that these domains exist in isolation.1

Furthermore, Putnam’s critique was part of a broader shift in his philosophical sensibilities, where he became increasingly critical of "scientism"—the view that all knowledge is scientific. He advocated for philosophy to return to its traditional role of guiding and inspiring human life, emphasizing that epistemic concerns, such as the reasons behind our beliefs, often carry significant moral weight. Through this lens, he maintained a deep sense of moral commitment alongside his pursuit of objective truth.1