We also invest heavily in preventing such a nuclear exchange.
Of course we continue on, we hope or expect that we will still be here. Rather than just lob missiles or give up, we took a stance and many active and expensive steps costing the equivalent of trillions of modern dollars. We definitely took real action on the Threat of Nuclear war.
We also invest incredibly heavily into making such a nuclear exchange more likely. We've sunk trillions of dollars into building a collective suicide switch.
We don't need more then a hundred nuclear weapons for MAD to work. Meanwhile, Russia and the US are pointing thousands of them at each-other. (And in the US, at least, the minimum number of people required to authorize a launch is tragically small. In a time of escalated tensions, a president can bring about the end of the world, without the consent of anyone else. There is no law or military process that can prevent it.)
Even if the odds of nuclear war were 1% in my lifetime, it would be an unacceptable level of risk. I wouldn't be surprised if it is, in reality, much higher.
Of course we continue on, we hope or expect that we will still be here. Rather than just lob missiles or give up, we took a stance and many active and expensive steps costing the equivalent of trillions of modern dollars. We definitely took real action on the Threat of Nuclear war.