Lets turn your argument on its head, if you thumb through a modern bible, based on the CT, you will find many small and some large bracketed words, phrases, verses and passages. However if you did a word count, you would find the questionable parts amount to only a small fraction of the total. So if your "number of examples" holds water, it argues against your premise.
Second, if we excised all of the bracketed material, the bible would convey the same message, only better with less corruption from the ever helpful copiests.
As an aside, your listing of witnesses lacking the LEM seems to reject the material presented by both B.Metzger and D. Wallace.
Bottom line, the corruptions existing in the text that have been exposed argues for the purity of the bulk of our text, rather than against it.