The image of an abandoned, wandering flock powerfully illustrates the destructive consequences of failed leadership. Without a guiding hand, sheep scatter into dangerous territories while the shepherds meant to protect them remain completely indifferent. This physical dispersal mirrors a deep national and spiritual crisis, where the absence of proper guidance leads directly to the collapse of society.
The constant, aimless movement of the flock represents a profound loss of direction [מצודת ציון, רד״ק]. As the sheep climb high mountains and descend to the hills below, they forget their original home and scatter in every direction without knowing where they are headed [מלבי״ם, מצודת דוד]. The primary approach among commentators is that these straying sheep symbolize the nation, left defenseless by its own leaders. Instead of acting as faithful shepherds, the kings and leaders cared only for themselves. They oppressed the masses, ignored justice, and failed to correct those who did wrong [רש״י, אברבנאל, ביאור שטיינזלץ]. Left without guidance, the people descended into lawlessness, with everyone simply doing as they pleased [רש״י].
The specific locations where the flock wanders carry a deeper meaning. Roaming over mountains and hills symbolizes the nation's spiritual decline into idolatry, as these foreign rituals were typically performed in high, open spaces [אברבנאל, ביאור שטיינזלץ]. Ultimately, this spiritual and social breakdown led to exile. The people were scattered among the nations, wandering endlessly and becoming prey to foreign empires that further corrupted them [מצודת דוד, אברבנאל].
In the face of this unfolding disaster, the absolute apathy of the leaders is striking. When a flock is lost, a responsible shepherd normally takes two distinct actions: first, a physical search to locate the missing sheep, and second, an active investigation to demand the animals back from anyone who might have found them. The tragedy here is twofold. Not only is no one investigating or demanding the return of the lost flock, but no one even bothers to begin the basic physical search [מלבי״ם]. On a national level, this total indifference means that no leader is attempting to gather the scattered people, return them to the right path, or save them from complete destruction [מצודת דוד, אברבנאל].