1 Samuel 27:10-11 When Achish asked, “Where did you go raiding today?” David would say, “Against the Negev of Judah” or “Against the Negev of Jerahmeel” or “Against the Negev of the Kenites.” He did not leave a man or woman alive to be brought to Gath, for he thought, “They might inform on us and say, ‘This is what David did.’” And such was his practice as long as he lived in Philistine territory. 
David hurt others on purpose to protect himself long before his encounter with Bathsheeba. Even the “man after God’s own heart” had his downfalls. Lord, thank You for loving me I spite of myself.