We did this in the 1980s…Google Proud Prophet.
Any limited use of nuclear weapons pretty much is guaranteed to result in a full-scale exchange.
Even Ronald Reagan finally accepted this.
And of course we just increased the probability of this happening by deploying a low yield nuclear weapon onto our subs.
On the same missile that would carry a high yield weapon…so any enemy, of course, wouldn’t know which one we launched.
The farther and farther we get from our last destructive war (WW II), the more of us that remember the Cold War that die off, the greater the likelihood we’ll stumble into a new war.
Because humanity is stupid.
Maybe this is the answer to the Fermi Paradox.