Several of those disasters, of scales arguably larger than Chernobyl, were caused by attempts to generate power. And although I do not have any evidence to back this, I suspect the total number of casualties resulting from burning fossil fuels over the past century far exceeds that from nuclear power related accidents.
The one aspect of nuclear accidents I'd be willing to concede is the long-term contamination of the area, but while rendering chunks of land unusable, it is not a direct threat to life.