Silence is very time consuming.
Waiting behind people who don't go when the light turns green. Waiting to get around people who don't realize they are blocking your path. Waiting for responses to emails because you can't call the company on the phone.
When you are silent, people become a lot less aware of you. Conversely, silence makes you a lot more aware of them.
Silence is a futile attempt to pause life so you have time to think.