You: > [...] USSR used a system called dead hand [0] https://en.wikipedia.org/wiki/Dead_Hand to detect a nuclear attack and to retaliate. [...] USSR required a nuclear retaliatory system that could prevent hasty decisions. Hence Dead Hand system.

Wikipedia article you linked: "Dead Hand [...] is a Cold War–era automatic or semi-automatic nuclear weapons control system [...] that was constructed by the Soviet Union. The system remains in use in the post-Soviet Russian Federation. An example of fail-deadly and mutual assured destruction deterrence, it can initiate the launch of the Russian intercontinental ballistic missiles (ICBMs) by sending a pre-entered highest-authority order from the General Staff of the Armed Forces, Strategic Missile Force Management to command posts and individual silos if a nuclear strike is detected by seismic, light, radioactivity, and pressure sensors even with the commanding elements fully destroyed."

I have no idea how you got from "automated nuclear weapons launch system" to "prevents hasty decisions". Seems like the opposite to me: an incredibly irresponsible system that has more of a chance of responding to a false positive than, demonstrably, human operators.