I think the perceived "black swan event risk" of nuclear is the result of over-hyping a few incidents rather than doing a rational across the board risk assessment. When a rational across the board risk assessment is done, nuclear does less harm per unit of power generated than any other energy technology. But the harm from other technologies is distributed in space and time (for example, coal dust in the air and radioactivity in coal ash), so it doesn't get the big media play.