I fully agree with you. It is too harsh to expect from people like me, who think in a different language (in my case it is Bengali) and live in a form of life, which is quite alien to the Western world, that they will be always grammatically correct, unless someone comes forward with her editorial help. Fortunately, I got an editor for my works now. A friend of mine, Jian Sierra,came forward with his editorial help.
But the question remains why should people post in this forum, if they can't write perfect English? I think most of them find this forum one of the very few places on earth where they can post their thoughts and experiences before likeminded people. Some are so inexperienced in writing that they can't even articulate what they want to say. You can always choose what you want to read and what you don't want. But please don't deprive them of your sympathy. They are indeed very lonely people. This is my humble appeal, not meant to hurt anybody.