Reddit reviews SuperFuel: Thorium, the Green Energy Source for the Future (MacSci)

Read this. We had a working reactor back in the 1950s. TLDR: It was thrown in the bin because the Navy wanted a water cooled reactor (because they were familiar with working with heated water under pressure) for their nuclear subs that could be re purposed as a civilian reactor that could also produce plutonium for bombs.

We have a design for a liquid thorium reactor, but you can't "prove" it works unless someone actually builds the 'effing thing.