Contrary to popular belief, fewer warheads is not necessarily better. You can never un-invent nuclear weapons, and put the genie back in the bottle. The only question is where you want to be in the food chain.
300 warheads is no longer a “Deterrent”.
The ONLY thing that accomplishes is to make thermonuclear war “Thinkable”.
Real problem is growing availability of nuclear weapon. One thing if only USA and USSR had it, another thing if it is owned by some kind of Asscrapistan.
And it looks like muslims will have it in numbers in a decade or so (just look at Caliphate of ME&Africa in making with both technology and economic power.)