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Should we calculate deaths by pollution in general and treat them as murder? It would be an interesting reminder on what our technological society is built.It sounds like a can of worms you definitely do not want to open. It's probably uncomputable. Sure, pollution may directly decrease people's life span. But having private cars, ambulances and helicopters being able to transfer people to specialized hospitals in emergencies directly saves lives. So does a generator providing emergency power for said hospital. Then there are n-th order effects of how our fossil-fuel-based civilization impact peoples' health and lifespans. It's likely impossible in practice to meaningfully untie all those interdependencies in order to put a meaningful body count on diesel engines. It's prohibitive to even do this on the margin.
On the other hand, a clear fact remains: diesel emissions are bad for peoples' health, and an engine that pollutes more is worse than one that pollutes less. It's an externality, just one that's hard to price on the margin.
So perhaps we should sidestep the problem and price in the externality in bulk. To the extent that a given type of pollution, in aggregate, causes health problems, we should tax it in proportion and funnel the funds into public healthcare.