My questions is this. If I give a negative rating to another user for a reason I think is justified and in return that same user gives me a negative rating as a retaliation what do the forum moderators do in this case, or better how do we deal with such issues?[/quote]

Nothing, it's exactly what the staff will do. As mentioned in the forum rules, feedbacks aren't moderated
surely a few reasons are because:
- they will need to spend the time to investigate issues which can be hard to do, time-consuming.
- if they start to do it from today, moderators will be overloaded with requests like they have never been before