It's true that nuclear power had it's own unique problems but so does Blacklight power's process. It just has a different set of problems.Einstein only had a theory on paper, math seemed to work out, but radiation is a killer, once the reaction started, there was no guarantee it could be stopped, controlled, or even safe. Not to mention the amount of energy that could be potentially released. Some believed that once the chain reaction started, all things would be consumed, not just the intended radioactive fuel. Can't really compare this to a Nickel compound/mixture.
But, if you really think about it.. it makes sense that some big revolution in power would require just this kind of controversy.. because if it didn't require this kind of controversy.. we would already be aware of it.
The problem with Mills' discovery is that the product of his process is a substance that hasn't been found on earth.. but again.. if it had this would all be common knowledge already.