> No real accounting has ever been made of the number of people who got cancer and/or died from nuclear activities,
First of all, nuclear weaponry waste from WW2 and the Cold War are wholly unrelated to activities of civilian nuclear power. While the material is similar in nature, you do not need to melt commercial waste down into radioactive vats of acid to extract pure weapons-grade plutonium in order to make low-carbon commercial nuclear energy. The civilian waste is solid ceramic and sits on parking lots at nuclear sites, where multiple decades of waste can fit nicely on a small area. Again, that's the glory of high energy density.
For Chernobyl and Fukushima, people absolutely count the effects. For example, UNSCEAR's entire mission is to do just that [1]. So far the counts are in, ~60 direct deaths from Chernobyl plus up to 4000 early cancer deaths on top of a few million that would have occurred naturally (small increase). Up to 1 death from Fukushima. As it turns out, more people die from coal plants operating normally every day than have died from nuclear accidents ever.
> As far as your Wikipedia link, it was uploaded by an individual person. No references there.
That'd be Figure 2 from the CBO in [2].
Helen Caldicott is the laughing stock of many respectable scientists. Don't make me dig up some of the ridiculous stuff she's said. She's a true clown.
[1] https://www.unscear.org/docs/reports/2008/09-86753_Report_20...
[2] https://www.cbo.gov/system/files/115th-congress-2017-2018/re...