The truth is we don't know why and how they developed. I wrote about it here: https://news.ycombinator.com/item?id=32507527 https://news.ycombinator.com/item?i

The truth is we don't know why and how they developed. I wrote about it here: https://news.ycombinator.com/item?id=32507527 https://news.ycombinator.com/item?id=32507527 Similarly like only after living 7 years in Israel I discovered that "white meat" is an euphemism for pork. Also the reality is much more complex. We tend to project our current understanding into the past. The reality of keeping Kashrut back then wasn't as we understand it today. -- The lifestyle of Eastern European Jews from the beginning of the 20th century until World War II - between keeping the mitzvot and secularization [Hebrew] https://www.youtube.com/watch?v=nfrFQH6RzZc https://www.youtube.com/watch?v=nfrFQH6RzZc