Well, there are, of course, a number of reasons, but perhaps the primary reason is because we're still organized as a species in the same way that we were organized 200 or 300 years ago.
Protams, ir vairāki iemesli, bet iespējams galvenais no tiem, ka kā suga vēl joprojām esam organizēti tāpat kā pirms 200 vai 300 gadiem.