By The viewpoint of both stories where the Gods are described as being impersonal is just a manifestation that God's see humans as play things.
In the Iliad, most of what the Gods do to humans have in large part have to do with their respect for fate. Fate is the predestined end for all mankind which Zeus chooses for everybody. If a God has a grudge against a human for not supplicating to ask him for assistance the God cannot help his enemy to destroy him without first asking Zeus for permission, so one could describe fate as ultimately Zeus's will. For instance, when the Argives built the wall during the time when both the Trojan and Argives were burying their dead Poseidon became infuriated when Agamemnon forgot to make a sacrifice offering to him. Poseidon was promised by Zeus that only after the war and Troy's predestined destruction could Poseidon take his revenge on Agamemnon by crushing the wall.
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