As other people have pointed out, this doesn't exactly arrive at a "root" cause, just a convenient one for the asker. You can keep asking "why?" until the problem is no longer your fault.
This is a question of economics. When patrons are discouraged from conversation they are more apt to spend more time drinking and more money at the bar. http://www.webmd.com/food-recipes/news/20080718/loud-bar-mus...
As other people have pointed out, this doesn't exactly arrive at a "root" cause, just a convenient one for the asker. You can keep asking "why?" until the problem is no longer your fault.
This is a question of economics. When patrons are discouraged from conversation they are more apt to spend more time drinking and more money at the bar. http://www.webmd.com/food-recipes/news/20080718/loud-bar-mus...