Originally Posted by Oh, Why Not?
Prescriptivists vs Descriptivists
Prescriptivists think the language belongs to them, or a least they hold it hostage for "purity"; Descriptivists know that the language belongs to the people who use it and are delighted by its fluxuations. A good writer knows the conventions of his language and how to use them. A great writer knows the conventions of his language and how to break them--a sort of literate terrorist.
Although that is absolutely true, there is no variant of English that I'm aware of in which it's considered "legitimate" to use "it's" as a possessive pronoun, which was the original issue at state.
It just completely and utterly baffles me why so many people get this wrong. How difficult is it to remember that "it's" means "it is", and "its" means "belonging to it"? This is not "rocket science"!