Reinsurance has nothing to do with it. Lawyers could convince a judge to make the nuclear plant insurance pay out to earthquake victims because no one else can. The increase in the premium from the amortized risk of that happening is the same whether you spread it across other insurance companies or not.
Try going to a major insurance company to get a policy that pays out in the amount of two hundred billion dollars in the event that you're abducted by aliens. If you can get the policy at all, the premium will be unaffordable, and it's not because the insurance company thinks there is a significant probability that you'll actually be abducted by aliens.
Try going to a major insurance company to get a policy that pays out in the amount of two hundred billion dollars in the event that you're abducted by aliens. If you can get the policy at all, the premium will be unaffordable, and it's not because the insurance company thinks there is a significant probability that you'll actually be abducted by aliens.