Divine Intervention

What I find the most interesting about Greek mythology is the massive amount of influence the gods play on humanity. Not only do they watch over the people and have a say in everything they do, they even take human form and come to Earth. This is so different from modern religions in which the gods are all knowing but stay out of our lives for the concept of free will. So my question is this. Why do you think the Greek gods and goddesses interfer in the war (besides the obvious Aphrodite protecting her claim to most beautiful goddess) even after Zeus calls a withdrawal?