The effect environmentalists have on adoption is a rounding error compared to the humongous cost of nuclear power.

Most non nuclear powers have a few for the same reason Iran does: having some nuclear scientists and a developed nuclear industry around is handy in case of a, uh, geopolitical "emergency". This is why Poland suddenly became interested in 2023 specifically.

Most countries do not want a lot though - it's too expensive.

I agree, I also believe the overall startup cost and low ROI is more relevant than the occasional tree-hugger’s limited political influence.