Irrational; there is only one standard for scripture. You seem to have ceded that point and hold a different standard for a certain set of books than others, which exposes another flaw in Sola Scriptura. The only custodians that transmitted all the scripture from one generation to another was the one holy catholic apostolic church, comprised of both Jews and Gentiles.
The Old Testament scriptures were entrusted to the Jews NOT the Catholics. If you want to include books that tell you to burn fish hearts to ward off demons you go right ahead but the Jews did not.