You know why? Because of fearmongering, redtape, and utter bullshit detractors every step of the way.
Nuclear power could be cheap and pervasive and safe and clean.
But noooooo. We have had decades of bullshit from people who barely got through 5th grade science making policies or voting in people making policies.
People piss themselves when you mention "nuclear" and other energy companies played it up.