I hear this sentiment a lot (in all contexts, not just novels), but it's always unclear to me what the intention is. Novels should never have a political message? As rarely as possible? Who is arguing that novels should forgo telling a "good" story in addition to whatever else they're doing? I appreciate that there are certainly interesting points to make here, but unfortunately, it always seems like the majority of people making this case are just saying "I stick to my camp and hate hearing the opinions of the other camp" (not accusing you of this without more context).