Final answer:
Meleager kills his uncles due to a conflict over the prize of the Calydonian boar hunt, which Meleager had bestowed upon Atalanta, leading to a fatal dispute.
Step-by-step explanation:
According to Bacchylides 5, the character Meleager kills his uncles because of a dispute that arises in the aftermath of the Calydonian boar hunt. Meleager awards the prized hide of the boar to Atalanta, but his uncles, who are displeased with this distribution of honor, take the hide away. In furious retaliation for this offense and dishonor, Meleager slays his uncles.