So why not make the law something reasonable, related to how long the child is actually left in the vehicle, and whether the parent is creating a risk to the li

So why not make the law something reasonable, related to how long the child is actually left in the vehicle, and whether the parent is creating a risk to the life of the child (based on temperature, for example)? It seems like the people who are likely to be influenced by this law are those who are sensitive/compliant enough to even know it exists, and people who would consider leaving their kids in the car and forgetting for 15 minutes would be completely unaffected.