I'll tell you exactly why apple, pear, and grape juices are in there: they are basically pure sugar. They can claim "no added sugar" and "100% juice". So you can add those to the list of deceptions on the package.

Re: 100% cranberry juice, this product is not sold as a juice drink because, well, try tasting it without dilution and adding sugar. So it will either be <20% juice or a blend like the one here. Orange/tangerine juices, on the other hand, are quite consumable at 100% strength.