Paul,
You've been a good sport throughout this thread, despite tremendous ribbing, and in your defense I must add that there was a time when incorrect punctuation, and grammar, and spelling was/were thought to indicate a lack of education. However, my direct experience with several thousand post-graduates, MBA's, Phd's, proves otherwise. Those with advanced degrees also make the same or similar errors although admittedly less frequently and often in innocence, correcting the errors if they discover them. Interestingly, a great number of them also lack reading comprehension skills despite the fact that interpretation of the written word is a major requirement in their profession. It's something that should have been mastered in high-school or college.
Nonetheless, the emphasis on perfect punctuation and grammar usage is on the wane. Communicate an idea succinctly and clearly and you have succeeded in the use of the language. At least that appears to be the current standard. Should we revert to a standard of perfection in usage?? It would be great, but it's not a reasonable expectation. It's not hard to imagine the Queen's Court in the 19th Century feeling the same distress over Americans common-use of English and the severe damage that would cause to the Commonwealth. Somehow we survived that calamity only to face one of our own making as we watch the evolution with trepidation.