I think it is something like the old joke where you tell the doctor that it hurts when you do something and the doctor says stop doing it. Often, we can elimina

I think it is something like the old joke where you tell the doctor that it hurts when you do something and the doctor says stop doing it. Often, we can eliminate the problem by factoring it out altogether. In this case people observed the problem to be solved as a failing test case. The author could have avoided being ask why by just stating the facts and not trying to explain why he observed it.