One problem with nuclear is that we've spent decades of R&D time ignoring the possibility of low space, low waste reactors that we have very little time to complete development on them.

The risk of catastrophic failure has been shown repeatedly to be something that arse-covering bureaucrats are incapable of handling.

The passive shutdown of the LFTR design, coupled with low area utilisation and the reduced risk of proliferation would have made it an ideal olive branch to the world.

But there's not much money to be made from ubiquitous energy.