I tried to let this sink a bit but I have no idea what you mean with your example. Was the Amazon-iRobot merger somehow a clear case that should and could have been forbidden? I don't know anything about that merger but to me it sounds like they are mainly in completely different fields so I don't get how it applies here.
antitrust enforcers starting with Lina K are so incompetent that they cant win open and shut cases
Exhibit A: action against a merger between Amazon and a robo-vaccum company, iRobot.
Let that sink for a minute.