Final answer:
In Iliad 21, the gods feel compelled to enter the war for personal connections, personal agendas, and to uphold their honor and status.
Step-by-step explanation:
In Iliad 21, the gods feel compelled to enter the war for several reasons. One reason is that they have personal connections with the mortal warriors, and they want to protect and support them. For example, Athena supports Achilles because she favors the Greeks, while Apollo supports Hector because he favors the Trojans. Another reason is that the gods have their own personal agendas and interests, and they see the war as an opportunity to further their own goals or settle personal grievances. Finally, the gods also enter the war to uphold their own honor and maintain their status as powerful and respected beings.