This dissertation intends to demonstrate that traditional just causes (fulfillment of legal duty, due obedience, justifying state of need, legitimate defense, full exercise of rights, public charge or lawful activity) are, in fact, forms of “acceptable risk”. So, they must be examined within the field of objective imputation, as true atypical cause, instead of typical behavior lacking of illegality. Thus, and in view of the facts that harmfulness has been long considered a criterion of objective categorization, we are witnessing a definite drop of tripartite system of crime, whose long agony was only the chronicle of a foretold death. Such drop happens because the purpose, formerly fulfilled by the concept of illegality in the criminal justice system, has been satisfied today by the analytic criteria that structure objective imputation