As is often the case I find today in the Chruch the main problem with it that I can see is what it does not say, it fails to mention culpable ignorance, and so leaves the reader with the impression that ignorance, as well as been bliss is a guard against all mortal sin, in which case we would be better off if there never was a Church to teach us anything.
However that is not the case, ignorance in itself can be a mortal sin according to, among others, St. Thomas Aquinas.