It isn't impossible, but it isn't as clean cut as you're making it out to be IMO.
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It isn't impossible, but it isn't as easy as you think it is.
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Well, I didn't mean to see that is was quite easy (rather possible). We can easily agree that for most people, it is relatively easy(easier) in comparison to the very difficult languages (e.g. Mandarin). However, this isn't really the place to go in-depth about language-difficulty, so I'll leave it at that.
I don't believe anyone is a perfect English speaker on this forum. Even natives such as myself still make a good amount of mistakes when typing or reading replies.
I concur. As long as the person can express themselves in an understandable way and has decent spelling and punctuation, then it is fine. Otherwise, most people will not be able to understand you so there would be no point in posting.
We don't care about other people's nationalities.
Exactly.
If you continue to post with broken english even after being told that you need to learn to write better, then people will start getting very annoyed.
The forum offers a good opportunity to learn English if you participate in the community for the right reasons. If you compare your own posts at the time of joining and now (assuming you're a non-native && that you've been around for a while), you should see a difference (variation depends on time invested on key-language aspects).