Well this section is already about trading discussion and does not need any sub-section for trading losses, If that will be the case we should also add sub-section for trading winnings?
Trading discussion board is open for any trading-related materials, losses, winnings, trading strategies and news/announcements regarding trading. What we need to do is to start more specific discussion, a particular matter that would directly benefit you for trading and people should be open with theirs in return.
You are right, for as long as it tackles trading so there is nothing wrong with it, so for traders who would like to share their losses too feel free to do it here, we won't judge but we will help each other analyze things, well, there is no perfect analysis in trading, even the very expert also incurring losses, so we should not be ashamed of it, for as long as we won't give up.