2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/93683We discuss a number of comments on quant-ph/9801061, and propose to introduce the concept of 'Causal Indistinguishability'. The incompatibility between Quantum Mechanics and Nonlocal Causality appears to be unavoidable: upholding of Quantum Mechanics by experiment would mean to live with influences backward in time, just as we are now living with such faster than light.16 pages Latex, 1 eps figure. The same content differently arranged has been submitted to Physics Letters AQuantum Physicstext