"Dogs sniff each other's butts. Should we do that too?"
Actually we humans do quite a good job at that, better than dogs even. The expression/epithet "brown noser" didn't come into existence by accident.
Depending on where you live, even in the States, there is a good percentage of folks who still eat organ meats. There is/are places that are almost even famous for ways they use organ meats. Louisiana has blood sausage, W Virginia has scrapple, etc. I worked with guys from W Va that butchered hogs and used each and every part for something. Even the hair was used to caulk boats. They have a saying that "parts is parts".