Good thinking, however we have some sections in the forum where the learners can ask their questions without any hesitation, and they post any kind of questions regarding English language whether Grammar, Vocabulary and Writing etc. Those sections are (Grammar Help, Vocabulary Help, Writing help and Help each other with English where all your questions are answered by the Forum teachers with a detailed explanation.
I agree with your point of veiw that two errors do not make a right, however if the learners post their questions and confusion regarding the words, sentences and grammar, so we can make them understand and provide better solutions.
This is the place where we can learn from each others mistakes, havent you heard that (If there were no fools in the world so where would the wise people learn from)? It is just a proverb in our native language i translated to English which means that if the learners dont express themselves freely so how can we rectify them. It is good source of improving your english to express your feelings and thoughts to others and they check it.