There are risks and there are risks…
Looks like most of the conceivable Really Crazy Nuclear StuffTM was already tested in the 1950ies and 1960ies, followed by Seemed Like A Good Idea At The TimeTM projects in the 1970ies and 1980ies. Looking back I’d say that we were lucky and got off lightly.
Nuclear power has its uses, but a lot of the time the cost-benefit ratio is just abysmal.
As to the warheads - standard procedure since the early 1950ies.
I spent the better part of 1986 guarding tactical nukes and being trained to fight WW3.
The number of nukes in the world today is just a mere fraction of what is was then.