While Post #2 is plausible, it is assuming that population growth is the same as overpopulation. This is not necessarily the case.
In Japan, for example, an impending decline in population is seen as a major worry. Japan has the resources to support a larger population, but only if a larger part of the population is of working age. This shows us that population growth can actually be a good thing. With more people, a country can have more human resources. If it has enough natural resources (as many countries do), this increase in human resources can actually help the economy.
So I agree that overpopulation is always bad, but population growth and overpopulation are not necessarily the same thing.