The rationale is to point out that the worst nuclear accident since Chernobyl caused one fully attributable death (and an expected 50 excess deaths in 50 years), but coal plants cause 10,000 deaths per year (500,000 in 50 years) when they are working as designed.

Yet nuclear is labelled dangerous and unhealthy.

I have seen it alleged (I have yet to confirm) that the coal funded scare campaign about nuclear power in the 1960s was where tobacco learned its science-denying tactics used in the 1970s-1990s, which were later adopted by the climate change denial astroturfers.