Double Standard

I really liked the movie Double Indemnity. It was interesting that everyone assumed that the main character was the “good guy,” but was he really? If the “good guy” does bad things, does that still make him a “good” character? For instance, the main story arc-killing the husband. the husband,  while he was a jerk to Phyllis, had no idea what was coming. He was murdered in cold blood, and yet we applaud the murderer. We can’t help but feel sympathy for him, instead of the dead man. Is this hardboiled? I think it’s less clean-cut than that. Yes people die violently, but the plot of this film was much more conflicting and complex than any of the other stories we have seen and read so far. Why do we feel bad for the ones who committed the crime?