When I come here, I just type what I think at the moment. I spend enough time during the day being careful, I come here to relax.
That's not the case with people who don't write for money, which may explain why some (not all) folks like me are careless when you'd think we would be perfectionists. I agonize over a few words for an hour offline, so when I'm relaxing, I just let 'er rip, and I don't think it's that big a deal.