You're being obtuse. Clearly, the first time one encounters one of these murals, one will respond dramatically. The second time, ones response will be more measured. Encounter them enough, and one will have a confident response plan prepared - the driver will be conditionally trained to respond to false images of children painted on roadways, not children on roadways. Clearly, the driver will not accelerate towards the false image, but the driver may reasonably be expected to take a moment to analyze the veracity of what he is seeing before making an emergency maneuver. This moment increases the risk of collision (however slightly) in the event that it is not a display. Ironically, it punishes all drivers with increased risk (cautious or reckless), but reckless drivers are disproportionately more punished, because they have less time to decide on a reaction.
If, on the other hand, you believe that repeated encounters with the mural will have no conditioning effect on driver behavior, then the mural is purposeless under its own standard. Apparently, you intend to defend the mural. Your chosen route is poor.
Even if we assume that it is true that the driver is only responding violently due to their own negligence, why is avoiding a silly street painting worth the risk of an accident, under any circumstances? We accept this risk when swerving to avoid live children because a potential collision is worth avoiding a certain one in the rational mind, but it would be silly to test our flight-or-fight system intentionally to prove some kind of point.
Needless to say, I think these murals are a terrible idea.