Years ago, I came across a column on the demise of the apostrophe, called Are You Killing the Apostrophe. It makes no sense to me to discard a perfectly good and useful mark of punctuation simply because some people don’t know how to use it.
Why don’t they just learn, same as they have learned how to do any number of simple everyday tasks, such as hanging up a coat, boiling water, or locking their front doors? Do those people just throw their clothes on the floor, never make a hot drink, and trust the neighborhood safety patrol to keep on eye on things?
Most of the time, the apostrophe is used in noun possessions and in contractions. There are a couple of other uses, but these are the main two.
John’s books. The woman’s books. The women’s books. It’s (it is) a good book. The man who’s (who is) reading a book.