Scientific American has an excerpt from Myhrvold, Young and Bilet’s magnum opus, Modernist Cuisine, in which they discusses the often arbitrary, subjective and culturally bound nature of “food safety” rules and practices.
In decades past, pork was intrinsically less safe than other meats because of muscle infiltration by Trichinella and surface contamination from fecal-borne pathogens like Salmonella and Clostridium perfringens . As a result, people learned to tolerate overcooked pork, and farms raised pigs with increasing amounts of fat—far more fat than is typical in the wild ancestors of pigs such as wild boar. The extra fat helped to keep the meat moist when it was overcooked.
Since then… producers have vastly reduced the risk of contamination through preventive practices on the farm and in meat-processing facilities. Eventually the FDA relaxed the cooking requirements for pork; they are now no different than those for other meats. The irony is that few people noticed—culinary professionals and cookbook authors included….
After decades of consuming overcooked pork by necessity, the American public has little appetite for rare pork; it isn’t considered traditional. With a lack of cultural pressure or agitation for change by industry groups, the new standards are largely ignored, and many new publications leave the old cooking recommendations intact.
Clearly, cultural and political factors impinge on decisions about food safety. If you doubt that, note the contrast between the standards applied to pork and those applied to beef. Many people love rare steak or raw beef served as carpaccio or steak tartare, and in the United States alone, millions of people safely eat beef products, whether raw, rare, or well-done. Beef is part of the national culture, and any attempt to outlaw rare or raw steak in the United States would face an immense cultural and political backlash from both the consumers and the producers of beef.
…Cultural and political factors also explain why cheese made from raw milk is considered safe in France yet viewed with great skepticism in the United States. Traditional cheese-making techniques, used correctly and with proper quality controls, eliminate pathogens without the need for milk pasteurization. Millions of people safely consume raw milk cheese in France, and any call to ban such a fundamental part of French culture would meet with enormous resistance there….
Raw milk cheese aged less than 60 days cannot be imported into the United States and cannot legally cross U.S. state lines. Yet in 24 of the 50 states, it is perfectly legal to make, sell, and consume raw milk cheeses within the state. In most of Canada raw milk cheese is banned, but in the province of Quebec it is legal.
One point they don’t note is that there may be multiple equilibria–that is, it may be more dangerous to produce raw milk cheese in a country or region without a history of producing raw milk cheese than elsewhere. Still, this is no reason we shouldn’t be eating more horse.