Re: Fatal Flaw?
A love story is not an emotional, internal or "heart" story. Rick is pursuing a tangible thing: a person. Ilsa.
Yes, there are multiple stories going on, but Rick and Ilsa's story is what drives the entire plot of the movie. If Rick didn't love Ilsa, he would just hand over the letters and be clean of the entire mess. He would have his purported goal - neutrality - back. There is only a movie because he doesn't want to see Ilsa leave with Laszlo.
But he doesn't hand over the letters. He's caught in a love triangle, complicated by the fact that he's sympathetic to Laszlo's mission - and so is the woman he loves. It's a genius love triangle, but that's what the movie is.
I was afraid to say this and open up another front in the war, but I think dmizzo is right - Laszlo is the antagonist. He is what stands in the way of Rick and what he wants.