At season 1, ep 2, Frank Underwood walks out of his office after successfully sabotaging the would-be secretary of state and installing Durant as the new secretary of state, Frank walks into a homeless man being restrained by police officers.
Frank walks towards this homeless man and tells him something like "Do not scream, no one cares and no one will hear you, why do you not let those good officers take you home." This homeless man calms down and Frank walks away.
What is the point of this scene?