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"This is bad because of externalities, the externalities are big and will grow" is exactly why we don't have general nuclear power, saying it's the only argument doesn't make it a weak argument.

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When the cost is directly paid by the actor, it isn't an externality. It is the literal opposite of what externality means.

carbon emissions aren't currently paid for by the person paying for and using the electricity?

And pollution is usually not, or only partially, paid for by neither the energy producer nor the consumer. Thus it's an externality.

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