Why do editors use cautious eclecticism when working with contaminated classical texts?

In the field of textual criticism, editors use cautious eclecticism when working with contaminated classical texts because the genealogical or stemmatic method—which relies on a clear, "vertical" transmission of a text—becomes difficult or impossible to apply when a tradition is "open" or "contaminated".1

Contamination occurs when a copyist uses more than one exemplar or incorporates variants from multiple sources, meaning that different textual states coexist within a single witness. In such cases, a rigid application of the stemmatic method can lead to unreliable results. Consequently, editors of classical texts classify witnesses into groups based on the general character of their texts and choose between readings largely on the grounds of their intrinsic excellence. This approach acknowledges that authoritative evidence may survive even in late or generally corrupt sources, requiring the editor to exercise judgment and empiricism rather than relying solely on a mechanical family tree. Ultimately, the best critics reject the rigid application of any method if the results conflict with common sense, prioritizing the evaluation of variants based on their intrinsic merits.12