Jamieson, Fausset and Brown on 2 Samuel 12:11

11. I will raise up evil against thee out of thine own house, &c.--The prophet speaks of God threatening to do what He only permitted to be done. The fact is, that David's loss of character by the discovery of his crimes, tended, in the natural course of things, to diminish the respect of his family, to weaken the authority of his government, and to encourage the prevalence of many disorders throughout his kingdom.