I struggle with your interpretation of "exponentially". Maybe the R value or reproduction factor is more meaningful. It's about 1 under the current conditions. On average, one person infects just another person. You can easily kill two or three humans with a car. Following your philosophy of exponential guilt, the very first human (probably Chinese) takes of all the blame for millions of dead. Does that make sense?
Agreed, cars and alcohol are no good example. Take HIV / AIDS. Two HIV negative persons having sex without condom = no offense. One person positive, but did not know that, having sex without condom: no offense. Being positively tested and aware of that, having sex without telling the other person about AIDS and no condom: Punishment is very likely, but no prison. Even if the other person gets HIV, prison is not always the consequence. Why do we treat two (potentially) deadly virus diseases so differently?
When the pestilence came over Europe, innocent people were sentenced to death for alleged witchcraft. Even in these dark era, the upper class (e.g. church and nobility, today we would say administration and government) knew that these victims were innocent. They accepted the mob law, because they had no means to stop the plague and they had to calm down the people. Same situation here, most people have wet pants and call for immediate actions that are not at hand.