I don't think there is any perfect answer to this.

I think questions to

clarify peoples understanding of a feedback post is worth keeping and is of benefit to other members reading.

People jumping on the bandwagon and creating a witch hunt is not to be tolerated.

It is all about the individuals experience with a company.

As long as the facts and reasonable explanation is given then that stands.

Likewise if the trader in question has facts and a reasonable explanation to offer then it is there to be seen by all who view the post.

Maybe it requires a dedicated moderator.

Maybe all posts have to be screened by that mod before been allowed to be posted.

It's not a very active category so maybe possible?