In macbeth, why doesn’t duncan suspect that lady macbeth wishes him harm?

lady macbeth is duncan’s daughter, and she has always been dutiful and obedient to her father.

macbeth personally assures duncan that his wife has never hurt anyone, and duncan is foolish enough to believe him.

lady macbeth only reveals her ambition and her desire to see duncan murdered to her husband; she is kind to the king while he lives.

duncan is a decent king, but he is repeatedly shown to be oblivious to the dangers around him.