Comment by csallen

An analogy should not be judged on whether or not it can realistically happen, nor whether it can be manipulated in some way that capitalizes on the differences.

Because the point of an analogy is not to provide an realistic or identical situation. On the contrary, the point of an analogy is to use a different situation in order to illustrate a very narrow similarity and make a point.

If the analogy illustrates and makes that point well, then it succeeds.