"Already done. The Japanese have worked out how to extract uranium from seawater."
Not usable in today's unstable political environment. Uranium = potential atomic bomb = potential H-bomb trigger. Not even thorium is all that safe long-term since its byproduct can be processed with enough effort (and with a state-level adversary, effort is always a possibility) into weaponizable uranium.
Unless you can make something that is physically impossible to weaponize (and I think the opposite will happen--proving that ANY reactor technology CAN be subverted to make weapons), serious concerns will remain.
Biting the hand that feeds IT
