The Greatest Nuclear Threat?

There is a deal of concern expressed about the dangers of countries getting hold of nuclear weapons. Coupled with increasing interest in nuclear energy in Australia - widely regarded as a safer and carbon-reducing form of power generation (itself a point subject to intense debate), news of the death of an Iranian Nuclear Scientist ought to give us all pause for thought. The scientist died from poisoning with uranium hexafluoride gas at a uranium conversion facility. Such accidents raise concerns about the possibilities of another Chernobyl.
It could well be argued that there are few redeeming features for nuclear fuel, and all of them are outweighed by the potential downside. While we continue to invest energy, resources, money, and time into nuclear and oil-based energies, the renewable energy option continues to suffer - along with the entire planet - from neglect.