Why would evolution go backwards? They are getting safer and safer day by day.
Money, ability, interest, power... It's not evolution, it's not fixed in stone. Powerplants grow old and eventually (that's carefully put) somewhere someone will end up without the economy, ability or interest to replace them (safely) - Especially when one becomes dependant on them. Again, multiply by a million only to take into account the full chain to and from actual production of power. Then multiply it again to apply it to the world.
Uranium mining/extraction is way way less poluting than... iron mining/extraction. Seriously.
I'm talking about large scale usage; Accidents along the way, where they're most likely, will increase in frequency and scale. And this risk can not be downplayed (oil-spill example).
Also, there's little comparisson with iron mining/extraction, and moreover I'm not prepared to believe that statement just like that
I'd think you'd better use 'coal' instead of 'iron' there. That's a point that'd work and is pretty probable too
In the end the biggest problem is the extremely long term decission making with drastic consequences. That's my biggest gripe and not a small moral problem, imho.