Is there a reason we don't use molten salt reactors?

[Ezekiel 25:17]

I understand fission was used for nuclear bombs politics wise and MSR was thrown out. But we at this point where we don't need bombs like that. MRS would be a lot more safe and have way less waste than nuclear fission

 

[010101]

ha*

 

[Neuromancer]

Scarcity I'd assume.