>Linguistic purity movements continue to strike me as largely pointless. It seems better that language evolve naturally -- as long as it remains effective as a communication medium, what is the issue?
On the one hand I agree with you. The English we use now, even when written or spoken in a grammatically perfect way, is very different to the English used a couple of hundred years ago.
On the other hand, seeing "your/you're" or "they're/their/there" used incorrectly or interchangeably rustles my jimmies immeasurably.