Ignorance of the law is no defence – if we are in a position in which we know the rules, but choose to bend them for literary effect, that’s great. Unfortunately, the vast majority of people do not know the basic rules, and constant repetition of elementary mistakes does nothing to remedy the situation.
Having said that, there’s an important element in play, here; people are stupid, but a person is intelligent. Dumbing-down an article because one believes the readers won’t get it is irresponsible. Why not give a person correct grammar, and see how they cope with it? It’s hardly going to confuse them, and constant repetition of the correct form will eventually rub off. In fact, it’s probably the best way to learn it, especially if you don’t think you’re learning at the time.
I’d question the abilities of anyone who said, “I use incorrect grammar because my readers do”. What a cop-out!
