Sorry for being rude, I have just heard the same arguments over and over and over, and I am getting tired of them.
The reason as to why we haven’t built more storage sites is our fear, our fear of radiation, most people don’t understand how radiation works and have seen horrible photos and videos from Chernobyl and think that it is impossible to go there still.
It is the nimby crowd who has messed it up so completely.
Add to that the odd report about how to prevent future humans from the waste sites, something not needed, which plays on the fears.