Also political expedience. Most of this is 'waste' in the more literal sense of the word, unused material. We already know of reactor types that reduce this w

Also political expedience. Most of this is 'waste' in the more literal sense of the word, unused material. We already know of reactor types that reduce this waste, they're just seen as proliferation dangers (which is why the /military/ should operate the reactors, but with full public transparency and international monitoring in real time).