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I completely disagree. I try to write correctly because I'm obsessive, but that's my problem. The main thing is to not write total rubbish, so if you want to say something and you want to be understood and you want to not be a jerk, you'll put a modicum of effort into making what you write presentable. BUT the fact is, forums like this are of only slightly more value than a chat session. They truly have no long-term value, or if they do, then the writer will turn around later and write a blog article about the same thing.
Posting to online forums is nothing but absolute faffing about. One may learn something now and again, and some of the comments are indeed insightful and interesting, but it is PLAY. This is not work. We do not earn money or even any kind of meaningful browny points from doing this. We're just here to have a good time, like shooting the breeze at a pub or your local gaming club. The articles may be serious, but for most of us, reading them and especially for commenting on them, this is done purely for the enjoyment of it.
So if someone decides not to make a second pass over their comment to fix a mistake or two, then people just need to let it go. Especially if their point is still CLEAR. And even if it's not, why do we care? Just ignore it and move on.
Personally, I have another dozen or so CS and EE departments I have to submit employment applications to, so I'm going to stop mucking about and do that now.