Well not being an expert in the field, this is admittedly an extrapolation. However, what I have read is that after first use, spent fule still has 90% of its energy. Potentially we discard 9 times the available energy. I offered 3 to 5 times as I'm sure we would not get 9 times but maybe we could or maybe we could only recycle it once given our current science. Still getting twice the energy seems like a great idea to me.
https://www.energy.gov/ne/articles/5-fast-facts-about-spent-....
That nievely suggest to me that there is a bunch left to use. Hence why some countries recycle it back into fule.
I dont know how the recycling process works. The risks as stated by several articles seem to be that during reprocessing bad actors could get a hold of it.
Why are you so resistant to the idea that we might recycle and reuse spent fule rather than mine, refine, and discard new fule?