I would ask if the offender has excommunicated himself why the need of a formal process of excommunication?
Just to settle it and leave no doubt.
To show that someone in the Vatican has some, er... backbone.
Catholic bemoan what has become of their church and I see lack of church discipline as being one of the reasons.
Besides, the true church is obligated to exercise some level of church discipline.
Paul did it and encouraged it. Maybe that’s the problem.....
It was Paul.