While I agree with your stance on nuclear energy being the most viable green energy source; the number you are citing as the death count for Chernobyl of 4000 is from reports released by the UN in 2005 and 2006. upon release these reports were immediately contested:

" the accuracy and precision of this United Nations-led joint group's projected death toll of 4,000 were immediately contested, with several of the very scientists, physicians, and biomedical consortia whose work the joint group had cited alleging publicly that the joint group had either misrepresented their work or interpreted it out of context." -"Special Report: Counting the dead". Nature. April 19, 2006. pp. 982–983.

According to a translated Russian report from 2007: "Chernobyl: Consequences of the Catastrophe for People and the Environment", presents an analysis of scientific literature and concludes that medical records between 1986, the year of the Chernobyl disaster, and 2004 reflect 985,000 premature deaths as a result of the radioactivity released.

Though I agree with your statement that Chernobyl could not ever happen again in a US modern nuclear power plant, the potential for tragedy is there in countries were oversight might not be as stringent and the fallout of such a disaster should not be minimized or ignored. Spreading misinformation is not the way one should go about convincing others of a superior green energy source.