In terms of Tennessee Williams's being a Naturalist and believing in social determinism, Stanley as the strongest of the species--the audience hears in Scene 10 "the inhuman jungle voices"--is the winner. In his mind, he probably would say that Blanche deserved what has happened; in fact, he tells Blanche,
We've had this date with each other from the beginning!
Like the conquered female, Blanche moans and she sinks to her knees. Stanley claims his victim. A brute, he takes what is weaker without remorse. Stella, who has spent their lifetime together excusing his behavior, does so again, refusing to accept what Blanche, a fallen woman, tells her about her husband.