It is not about indignation. Self-righteousness is the conviction that one's beliefs are right and that anyone who disagrees with those beliefs is wrong.
Righteous indignation is a reactive emotion of anger over mistreatment, insult, or malice. It can be attributed to someone who feels they have been subjected to an injustice.
What David Brin is talking about is not applicable to someone who simply accepts the inerrancy of the Church's teaching as no anger, resentment or indignation is involved.
E.g. Catholics, who with the Church believe that homosexual activity is intrinsically disordered, are not exhibiting any anger or indignation nor do they feel any sense of injustice.
It seems that you trawl the internet searching for any entry, however obscure and irrelevant, which appears to support your beliefs which you are convinced are right and the Church's are wrong. Why don't you start your own church like the reformers if you can't accept what the Catholic Church and what it teaches?