[schoen]

Or more generally, people could argue about costs of different ways of mitigating deaths because maybe some non-environment-related issues are "cheaper" or "better" in some way to mitigate. There's not just the question of what causes the most deaths, but also the question of what could be done about it and how.

And people do have lots of ideas and arguments about those questions, like effective altruists' ideas about cheap medical interventions.