A profound gap often exists between the personal spiritual dedication of a leader and the religious reality of the general public. Even when a leader is fully committed, the people can struggle to implement deep changes. The primary approach among commentators is that the high places scattered across the land were not altars for idol worship. Instead, they were private altars dedicated entirely to the service of God. However, offering sacrifices on these private altars became strictly forbidden the moment the Temple was built in Jerusalem [מצודת דוד, רלב״ג, ביאור שטיינזלץ].
The continued existence of these altars does not reflect a religious flaw in King Jehoshaphat himself. He directed his own heart to God and avoided sacrificing on these private altars entirely; rather, the fault lay squarely with the people [מצודת דוד, מלבי״ם]. The public operated under a deep misunderstanding, mistakenly believing that it was a Commandment to offer sacrifices to God in any location. They failed to internalize that the worship of the one God was now meant to be centralized in a single, designated place. Because this belief was so deeply ingrained, any attempt by the king to remove the altars by force would have resulted in a public rebellion [מלבי״ם].
Ultimately, the people lacked true internal readiness. On a personal level, the citizens of Judah did not place a high enough value on God's word, nor did they observe it with strict care [ביאור שטיינזלץ]. This historical reality reveals that while a king may perfect his own spiritual path, complete spiritual repair cannot be forced from the top down by a strong leader alone. It demands a genuine shift in atmosphere and a deep internal transformation within the people themselves [מצודת דוד, ביאור שטיינזלץ].