Why does the Roman Catholic Church not hold to the perspicuity of Scripture?

From the very limited research that I've done thus far, it seems that the RCC does not hold to the perspicuity of Scripture. I'm not positive that this is true, though it seems to be. The meaning of "perspicuity of Scripture": > Those things which are necessary to be known, believed, and observed, for salvation, are so clearly propounded and opened in some place of Scripture or other, that not only the learned, but the unlearned, in a due use of the ordinary means, may attain unto a sufficient understanding of them. (Wikipedia ) Am I right, and if so, why does the Roman Catholic Church not hold to such a belief?