We didn't. Los Alamos is pretty busy this time of year. So is Sarov.
> we haven't done the R&D and optimization to lower the cost for mass producing neutron bombs too.
We had. And also, we were smart enough to put these papers on the shelf and not proceed with them.
Say what you want about humanity, but 70+ years without a nuclear war is impressive, given our history. It became possible through continuous innovation in game theory, spy games, and yes, improving the deterrents. I think nuclear weapons will never be actually used in large-scale future wars, like chemical weapons weren't massively used in WW2.
Progress is good. Wars are part of the progress. Wars themselves are bad, though, so some of the progress is spent to keep wars at bay, to not interfere with the progress.
