I think that's a little like asking if one should post when sleepy? One shouldn't drive when sleepy but being sleepy is a part of one's life. For some, being intoxicated is a part of their life. Another way of putting it; most of us post when distressed by our mental difficulties; should we only post when we're serene and feeling confident and know all the answers? What if drinking/drugging too much is part of one's mental difficulties?

Besides, enforcing such a "rule" would be impossible. One man's intoxication is another's depression/mania/anxiety?