Which was the worst government fuckup? Battle of Mogadishu, Waco Siege, Jonestown, or Chernobyl?

Chernobyl was caused by poor government and human error, the meltdown was preventable and the number of people and amount of land effected and the duration of those effects makes it the worst.

Modern nuclear power plants are safe and effective alternatives to fossil fuel though, literally anything is better than continuing to burn fossil fuels and we need to keep our options open.