In the novel Mudbound, what are the consequences of Jamie's inability to speak to his family about the horrors he experienced in the war? How does speaking or not speaking confer power or take it away?

The intrinsic relationship between speech and power is clearly conveyed in Hillary Jordan’s novel. Jamie is trying to adjust to life on the farm that he left behind when he joined the military. But he cannot face the fact that he has changed and the farm has changed. The sexual relationship that develops between him and his brother’s wife just makes the situation worse. The need for secrecy compounds Jamie’s problem of inability to speak, forcing him deeper into himself.
Although he morally opposes his father’s racism and Klan participation, Jamie does not speak out against their actions. He becomes an accomplice in their torture as he acquiesces to their order that he pronounce Ronsel’s fate. This vocal action temporarily gives him power over Ronsel, something he claimed not to want. His decision is to make Ronsel mute by having his tongue cut out. The enforced silencing equates the men in Jamie’s subconscious; now neither one can speak.
https://books.google.com/books/about/Mudbound.html?id=t3eQfaECtYEC