Re: Idiots
Uranium is substantially less common than thorium - and thorium is a common side-product of rare earth extraction which is currently a "nuisance" material.
Additionally, once you've extracted your thorium it's good to go.
Uranium needs to be "enriched" (U235 content increased by tossing out some of the U238) which is hideously expensive/energy intensive (the exact costs and energy requirements of enriching for the USA civil nuclear program are a Classified state secret) and leaves significant quantities of U238 looking for uses other than "colouring glass".
Uses which amongst other things include bullets(*) and bomb casings(**)
(*)bad, as they burn inside tanks, producing uranium oxide dust which contaminates the local environment and Uranium is a chemically toxic heavy metal...
(**)Doubly bad, as the bombs in question are "hydrogen bombs" and the U238 is used to boost the size of the explosion substantially (for neutron bombs, you substitute lead or tungsten for the U238)