What you said here: "If I am a bank making a loan what do I care about non-monetary gains?" is what the OP is talking about.
I think the logical conclusion you illustrate in your original post only covers the monetary analysis that a bank might make (as in how much do we profit from this)
That's the only thing a bank cares about and that's fine it's what their supposed to do. I think, the OP is just trying to say that there are more important things to consider, things that can't be easily monetized. That's why bankers shouldn't be the final decision point on this IF what the summary claims is true, that nuclear power can prevent "the ravages of climate disruption".