[youtube=http://www.youtube.com/watch?v=omg5edz6kIo&feature=player\_embedded\]
Plausible explanations:
hbd1: People are too inbred? Or too outbred? see hbdchick
hbd2: Asians are neotenic egocentric sobs
hbd3: Agricultural societies select for cold, heartless people see agnostic
Culturalism1: urban lifeĀ“s anonimity free people from having to give a shit
cult2: Commercialism makes people self absorbed
cult3: Americanisation broke the spirit of Japan see Mishima Yukio
cult4: The economy is bad, people are busy
Add your explanation if you can think of one.
My two cents: high population density sucks.