We don't because it's uncomfortable. It requires that we listen to perspectives with which we may disagree and listen to people we may not like.
It’s does feel counter-intuitive, but it turns out that being silent and truly listening is far more persuasive than speaking.
Silence is a greatly underestimated source of power. In silence, we can hear not only what is being said but also what is not being said. In silence, it can be easier to reach the truth.