It is quite refreshing to have an author like you in this community. The manners in which you disect scientific issues that directly affect everyone is quite brilliant. Sincere gratitude to you.

The issue of carrying capacity is better explained using the deer experiment. In the year 1944, 29 deer were introduced to an island that had no presence of the animal before. By the summer of year 1963, the deer had thrived and proliferated to 6,000. However, a rather unusual (but natural) event happened the following winter which led to the population of the animal decreasing rapidly from 6000 to less than 50.

The experiment clearly demonstrated that even though carrying capacity may be theoretical in the case of the earth and its human populace, it does exist in reality. Hence, an unchecked human population growth might not just lead to the limiting factors keeping the population size around the carrying capacity, but far below it. A natural but genocidal event could actually happen and might spell doom for a large portion of the human population.