by Yuval Levin[NationalReview] The very nature of the debate we are now having, including the debate over the travel ban, is evidence of the fact that we probably have not yet learned not to underestimate this outbreak. We are still thinking about it in terms of a crisis in Guinea, Liberia, and Sierra Leone that could reach our shores by the various means that connect us to them. But the real danger, to us and to others, is probably far greater than that. Our greatest worry should not be that the disease could get to the United States from those West African nations but that it will get to Nigeria's larger population centers or to, say, India or other places with massive population density and weak public-health systems, and from there will become an epidemic throughout the third world. The scale that this outbreak is now likely to reach in West Africa will make it rather difficult to prevent that, raising the risk of a far more colossal human catastrophe than the nightmare we are already witnessing and of a greater threat to the U.S. population.