If there is ever a real SHTF / TEOTWAWKI event, a large number of so called preppers are going to starve. Proof to back up that statement? Just look at the popular prepping related videos on youtube, or look at what forum sections get the most traffic.
The most popular types of videos on youtube are gun and tactical gear. It is not gardening, it is not chickens or other livestock, farming, homesteading, or prepsteading. The most popular types of videos are running and gunning videos.
You can not eat bullets, plate carriers, chest rigs, knives, or anything else that fuels the fantasy of a tacti-cool SHTF event.
During outbreaks of the plague in the middle ages, starvation killed a great number of people. Preppers may think they will leave the city and raid rural farms. Once again, history teaches us there is a good chance those people will die on the side of the road just outside the city. People will either starve before they reach rural areas, of they will die of disease.