Shared ground
The verse reports two things at once: a human political decision and a narrator’s explanation of what was happening underneath it. Absalom and “all the men of Israel” publicly rank Hushai’s advice as “better” than Ahithophel’s. The text also insists Ahithophel’s advice was genuinely “good” in quality, even though it was about to fail.
The narrator then connects this turning point to Yahweh’s intent: Yahweh had determined that Ahithophel’s good plan would be defeated, with the stated purpose that disaster (“evil” in the sense of calamity) would come upon Absalom.
Where interpretation differs
Some readers emphasize the divine side: Yahweh’s decision is presented as the decisive reason the counsel failed, so Absalom’s choice is part of a larger plan.
Others emphasize the human side: Absalom and his leaders still weigh, compare, and choose what seems “better,” and the narrator’s comment explains why that choice, for all its apparent plausibility, led to the outcome it did.
A smaller point of disagreement concerns “all the men of Israel.” Some take it broadly (a wide gathering representing Israel), while others read it more narrowly as leading men (elders, commanders, or representatives) who can speak for the movement.
Why the disagreement exists
The verse itself puts side-by-side (1) the council’s stated evaluation (“better”) and (2) a behind-the-scenes divine explanation (“Yahweh had ordained…”). Because both statements are strong and close together, interpreters differ on how to describe the relationship between them without canceling either one.
What this passage clearly contributes
This verse portrays Yahweh as actively directing outcomes in the political-military struggle, even when the immediate situation looks like ordinary strategizing. It also shows that “good” advice can still be made ineffective when the story’s divine purpose is moving toward a different end. Explicitly, the text states Yahweh’s intent is Absalom’s downfall, and it frames the rejection of Ahithophel as a key step toward that calamity (see 2 Samuel 17:14).