Good point, in fissionable material we are talking about energy density orders of magnitude greater than fossil carbon. And to me the waste disposal issue is just fear mongering in light of reprocessing and many disposal options.
But the energy density claim for fossil carbon is a bit shallow. E-Density in terms of per volume or per weight sure, but throw in the time dimension and not so great - it took a long time to accumulate that energy. Hence the renewable alternatives are valid in the sense of our thermodynamic demand being in equilibrium or steady state with the supply.
Just technically saying. Personally I'm all for US carbon development for world independence reasons.