Blame the linguists!
Linguist Veda Charrow has a column in the Washington Times that tries to break down America's deteriorating grammatical skills.
Earlier in the 20th century, professional writers and educated speakers could be expected to make few, if any, grammatical errors. Newspapers and magazines were edited not only for content and length, but for grammatical correctness. This is no longer the case. Newspapers, magazines, newscasts and, of course, the Internet are rife with errors like the ones above.She thinks linguists, and their training to not make value judgments, may be to blame. She discusses Noam Chomsky's theory of transformational-generative grammar (of which I know nothing about but sounds terribly interesting).
Her theory: People tried to incorporate the theory into their grammar lessons. Kids didn't really get it and therefore never really got a firm hold of grammar. And now those kids are the adults teaching students now. Trickle-down ignorance.
She ends with a call to action:
It's time again to formally teach traditional grammar in the schools. (And, yes, I know I split an infinitive, but English doesn't have true infinitives, so it's OK.)