Ethical software development remains stubbornly difficult despite two decades of normative frameworks, professional codes, and participatory methodologies. This paper offers a diagnostic rather than prescriptive contribution: it argues that the persistent gap between ethical intention and ethical implementation is a structural epistemic condition, not primarily a failure of will, education, or normative guidance. Three independently sufficient mechanisms interact to produce what I call the ethical knowledge gap -- a condition in which the knowledge required for ethically informed decision-making is systematically unavailable at the point of decision, even when the organization as a whole possesses it. First, drawing on Hayek's (1945) analysis of dispersed knowledge and its organizational extensions, the paper establishes that ethically relevant knowledge in software development is constitutively distributed across roles, largely tacit, and -- unlike efficiency-related knowledge -- unsupported by any spontaneous aggregation mechanism analogous to the price system. Second, an interpretive deficit, analyzed through Weick's sensemaking framework and the literature on framing and epistemic cultures, renders developers unable to recognize the ethical significance of what they know: the sensemaking apparatus of engineering culture makes technical decisions intelligible while systematically obscuring their ethical dimensions. Third, a credibility attenuation, analyzed through the social epistemology of testimony and epistemic dependence, discounts developers' observations as they cross organizational role boundaries, so that hybrid judgments combining technical detail with ethical assessment lose their epistemic force.

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