[adrianN]

The difference is that a dam disaster is fairly localized in both time and space and the damage is visible. When your feet are dry you're safe. With radiation, the area is poisoned for generations and the danger is invisible. You don't know whether eating that mushroom will lead to a birth defect in your next child.

[acidburnNSA]

That's probably part of it. Radiation is certainly a bit harder to detect with our human senses. Maybe if we put radiation detectors in every home and printed out XKCD dose effect charts people could make more risk-informed (as opposed to fear/uncertainty-informed) decisions.

https://xkcd.com/radiation/

Keep in mind that normal fossil fueled power plants are killing about 4.2 million people per year via air pollution, which is also largely invisible. I don't quite understand why radiation killing up to 4000 freaks people out so much more vs. air pollution killing 4.2 million/year.

https://www.who.int/airpollution/en/