I’d say this guy doesn’t trust or believe in God, and he’s judging a great man, not a perfect man.
David was an adulterer, a murderer and yet God made him a king who wrote Psalms. God doesn’t turn His back on the sinful nor someone who has glorified Him and set Israel as Gods people and Jerusalem as His capital. Those who bless Israel shall be blessed and those who curse Israel shall be cursed. So says the Lord.