Banqiao Dam failure alone killed an unknown number of people. The lower estimate is 26 000. The upper estimate is 240 000 people.

For Chernobyl the number is 4,000 deaths as the total number of projected deaths caused by the accident over the long term.

For Fukushima it's one direct death, and 2000 deaths due to evacuation.

Had we approached dams the way we approach nuclear power, not a single dam would be built in the world.