I blame the P.C. for the bad grammar (not so much the spelling).
I am a 'self taught' two finger typist. I can type reasonably fast, but I still have to look at the keyboard. I'm guaranteed to hit the right key, plus or minus one (up, down, left or right). The result is a first draft of total crap. I then run the spell checker over it (nearly always accepting the suggested correction). Problem is it doesn't always catch the spelling (I once wrote a memo about ‘socks of fire fighting foam’).
I always proof read it from the screen; problem is I now what it’s supposed to say ('cause I wrote it). But my proof reading will gloss over obvious spelling and grammar errors.
By the way, what's this thread supposed to be about?