Because we'll end up debating the analogy, one which does not correlate with the status of the UK leaving the EU. It is an overly simplied argument and the subject matter itself is much more involved. I've 'come to a debate' to give my opinion on how I perceive the EU, giving examples of what led me to form such an opinion. Examples which others can check, research and form their own conclusions in which they'll either agree, disagree or have an entirely different viewpoint to my own based on the exact same information.
You have come to the debate to tell others their opinions are misguided but without explaining to them why or giving a clear stance what your viewpoint would be if you had to choose on an opposing side. For example you still have not explained, in the event of an exit from the ones you listed and asked me to choose from, what scenario would be most beneficial for Britain. If you don't know, just say so.