I also don't see why someone like Coumo who is clearly among those who, "obstinately persist in manifest grave sin", and therefore someone to whom 915 applies, isn't included on some sort of regularly published list of "public figures" who have excommunicated themselves. A couple of Bishops, a few Nuns, a Priest here and there, and a lot of other politicians along with the entire faculty at a lot of schools that claim to be Catholic would be on the list with him so he wouldn't be unfairly singled out in any way. In fact, were such a list regularly published a lot of fascist democrat scum would probably be upset if their name were not on the list.
 Those upon whom the penalty of excommunication or interdict has been imposed or declared, and others who obstinately persist in manifest grave sin, are not to be admitted to holy communion.
That’s a good point and would actually be a somewhat weaselly out for the bishops. They wouldn’t have to do bell book and candle. They could just say, “These people have excommunicated themselves and are no longer Catholics in good standing”