Light wouldn't be Light without Darkness

"In the poem I wanted to compare love to the kind of light you sometimes see clinging to trees right after sunset: the magical sort of light. That's the kind of light people have inside them when they're in love with someone." This is comparing love to light which is suggesting that both are a good thing. "It's because we hate them in the name of the light, I guess, whereas they hate only in the name of darkness." This is saying that hate can also be a good thing even though it is the opposite of love. This compares light and dark as well as love and hate, but not as opposites, as comparing them as the same as each other. It is saying that they are opposites yet they are the same in the sense that they could not exist without each other.  Love would not be seen seen as such a great thing if everybody loved everybody and there was no hate in the world, because nobody would know the difference. In the same sense if there was never light in the world and everything was always dark, darkness would not be seen as a bad thing. Darkness would not be used as a motif to represent hatred or bad things because there is nothing to compare it to, it is the only thing people know.