Why? What particular harm are you worried about here? If there's harm to market participants then why should the players be immune? Why is a merger approval so inviolate?
> and I don't think bare market forces apply.
Why _wouldn't_ they? What forces _would_ you invoke to achieve justice? Or are you saying that because it's too inconvenient, we have to ignore the harms?
Market's don't exist for the benefit of companies. They exist for the benefit of citizens who both participate in them as consumers and as laborers. We wrote a lot of anti monopoly law for very good reasons, if shareholders are inconvenienced by having to unwind bad deals that shouldn't have been approved in the first place, I see no reason to afford them greater protection or deference than the fundamental participants of that market.