Plus you don't want it too quiet where everyone around you can hear what you are saying.
Ever watched movies where a couple of the characters are in a diner either plotting a major theft heist or a murder or trading industrial secrets or talking about a big conspiracy involving the CIA.
We have seen those scenes 100 times or maybe even 1000 times.
Every time I see one of those scenes, I always say to myself:
Those folks sitting in the booths right behind them or next to them can hear everything they are saying.
In real life you'd want to have this type of discussion sitting in a vehicle with the windows closed and the music on.