Nuclear waste is somewhat dangerous, but deep inside mountains it won't do any harm barring some kind of black swan event.
Compare the risks of living near a nuclear waste storage facility and living downstream of a hydroelectric dam. I know what I would choose! If you demand absolute certainty over a thousand year period you'll be paralyzed into inaction. Any new technology and any political action could result in the eventual collapse of civilization. But inaction guarantees disaster because the status quo is unsustainable. So we have to make mundane risk/reward evaluations and from those we conclude that we can't do without nuclear energy.
Compare the risks of living near a nuclear waste storage facility and living downstream of a hydroelectric dam. I know what I would choose! If you demand absolute certainty over a thousand year period you'll be paralyzed into inaction. Any new technology and any political action could result in the eventual collapse of civilization. But inaction guarantees disaster because the status quo is unsustainable. So we have to make mundane risk/reward evaluations and from those we conclude that we can't do without nuclear energy.