trad, you seem to be relegating authority to a mere secondary function at best. You make the claim that "any Catholic" can determine such things, when Canonists insist that laity have neither the canonical or moral right or competency to determine heresy, much less if a penalty has been in fact incurred. Negligence on the part of the hierarchy does not negate this necessary function of authority. It is authority alone who can determine a legal fact (whether a penalty has been incurred ipso facto) and if the Bishops fail in their divine responsibilities the Church suffers immense harm. Even moreso when they are themselves suspected of heresy. You and others reference the penalties of the unchanging Divine Law which is a theoretical truth indeed, but as has been mentioned, this is a matter of the internal forum; there must be a concrete determination if the Divine Law has even been engaged in a particular circuмstance. The Church judges according to the external forum alone. This is similiar to the notion that one must deduce conclusions from the Natural Law in the practical order, even though all the principles and conclusions are implicitly contained therein.
If we take your position, the laws of the Church and the actions of Rome in the past with regard to heretical clerics are rendered superfluous at best. It is in fact through canonical admonition that pertinacity is manifested in the external forum, thus these are an integral part of the Catholic system. It may help to understand the matter if you would view the Church in its principle aspect as a Body or Society, rather than the invisible aspect of the Church. I think there is a tendency among some to "spiritualize" the Church, rather than recognizing it first as a concrete, tangible, external society.