Adultery, betrayal, revenge, and retribution as David falls away from God’s path.
David now starts to pay his debts. He had promised Jonathan that if anything ever happened to him, he would look after his family. Jonathan’s son Mephibosheth is still alive and probably in hiding. He was crippled at a young age when he was dropped by his nurse. So he’s no great specimen of a leader in the physical sense, but he still has the blood of Saul and Jonathan in his veins. David could have easily seen him as a threat to his kingship. Instead of looking at him as a threat, he sees in him an opportunity that has multiple assets.