This is reminding me of an online game I play where people regularly come to the forums screaming “I wuz band 4 no rezun!!1”
I think that “no reason given” is a mischaracterization of what happens here and others have demonstrated why. I will be the first to admit that when I have gotten in big trouble, sometimes it is hard to see the reasons why, but hindsight is 20/20, and if I step back and think about it, I can point to the events leading up to my trouble and realize that people have tried to intercede and intervene and pull me back from the edge, but I did not listen. Young children need to be told the reason for being disciplined because otherwise they will not learn from the experience, but when we become adults we are expected to have a properly formed conscience and, barring mental illness or the like, we have an understanding of actions and consequences thereof.
It is super-amusing that someone calls the Vatican of this particular pontificate rude. It seems more like a Benedictine epithet, perhaps the mean old Emeritus’ curia still lingers on and you resent that element of it. But come on. Rome is a government (among other things, let’s not reduce it) and governments reserve the right to be harsh when the situation calls for it. I look around and I see many conservatives complaining about how lax Rome is when it comes to dissenting politicians and dissenting religious and ad-libbing priests, and then just one of them gets the hook, and it’s the liberals with a spittle-flecked nutty about the mean old men in dresses calling the shots.
Look at it this way. You can’t arrest all the speeders and throw them in jail. But you set up a speed trap and pull a few over and the rest of them fall into line, scared straight. Hopefully the people close to this one excommunicated Australian priest will re-examine their doctrine and consciences and come to the conclusion that obedience is better than Hell. In my diocese, one sister excommunicated herself over an abortion. This had lasting fallout and sent a very clear message that our bishop meant business about being pro-life. It was the straw that broke the camel’s back and I hope and pray that others saw the error of their ways, not wanting to end up like the good Sister, and recanted pro-abortion views rather than excommunicate themselves too.
Also remember as I hinted above that some excommunications are latae sententiae. This means that the commission of the very sin causes the excommunication automatically. The Church may make a determination that it happened but it doesn’t need to call a tribunal or issue a sentence, the penalty is already in effect.