Why did Moses not answer those who asked “Why should we be excluded?” simply by telling them that they were ritually impure through contact with a dead person?

This source-based Torah study examines the question: Why did Moses not answer those who asked “Why should we be excluded?” simply by telling them that they were ritually impure through contact with a dead person? The canonical Hebrew discussion develops the issue through the weekly Torah portion and the sources cited there, preserving the distinctions, tensions, and practical implications of the original text. This localized discovery layer does not add any new halakhic, medical, legal, scientific, historical, theological, or empirical ruling or claim beyond the canonical Hebrew source.