That's only some people though. I know I've thought of saving letters but in the end it's too much work and I just can't be bothered. Besides, I think that Tom has a point. Imagine if we could all just look up what was said or done a year ago... there'd be a lot less interpretations of certain agreements or actions. People would be able to twist events of years ago less into their favour and less conflict would ensue.
I honestly like that there's a sort of collective, unwritten memory, but with holes in it. 
That's called written history. The trick is authenticating it - you can just say it's fake.
As long as the messages aren't saved in game then it's no different then someone manually copying and pasting now.
