Jonnoh - I'm not sure what else can be said to address your apparent concern that hasn't already been said. Since you are an active participant on the forum and are wording your comments about good and bad retailers in a polite and constructive way I'll try once more.
Jonnoh wrote:
... I'm talking about truthful and honest opinions of businesses ...
You are referring to the "truthful and honest opinions" of the person posting the comment and not necessarily the facts of the situation. You may blame the non-delivery of an order on the useless business you ordered from so you vent your anger publicly, when the parcel may have been stolen from your doorstep or may still be somewhere in the postal system. I'm aware of businesses that rectify an honest mistake by replacing the wrong item at their expense or providing a full refund, but still they get openly criticised for their error with no mention of what they did to fix things.
Unlike some FB groups and other forums your comments are not reviewed and approved by a moderator before they are posted on here. We rely on the good manners of all to keep things nice. If the forum allowed uncontrolled mud-slinging, whether truthful or not, I don't think it would be a place that I would want to be involved in. As others have said there are many other ways to get your opinions across.