Shouldn't most of these s contractions (except the possessive case) be restricted to spoken English?
Shouldn't text data always be "correct"? Of course it should! What's wrong with all those idiots who can't follow the rules when they type?! Why should programmers have to worry about stupid mistakes in text data?
And while we're on the subject, why are so many people using those silly non-ASCII characters that look like apostrophes but really aren't? It really pisses me off when they do that - they should just be using the standard ASCII apostrophe, the way God intended!