Of course they don't obey differntet laws and a virus that does both spread fast and kills most of the infected will die out. Because it extinguishes enough of

Of course they don't obey differntet laws and a virus that does both spread fast and kills most of the infected will die out. Because it extinguishes enough of its host population so it can no longer spread. That is sort of the point in this discussion. If it affects just a small village or half a country or more depends on the incubation period.