Why is it good ? So that your country thinks they can "win" a nuclear war ?
In a perfect world there wouldn't be any nuclear weapon. But in our imperfect world I'd rather have MAD than some yahoo thinking first strike is a good idea because they think they can stop the opposite side from retaliating.
World with nukes appeared to be more peaceful than without. While nuclear superpowers have parity, conventional war between them is impossible. This is the reason why we we never had WWIII between Soviets/Russia/China and US/NATO. However, other measures like economical pressure and trade wars, espionage, proxy wars, and now informational war are still ongoing. I would leave as a statement that all these things are "much better" than real World War.
There's a lot of information that the USA only nominally had PAL. The military implemented PAL on orders from the President, but then set the PAL code to 00000000.
This is a reason why USSR never adopted a end-to-end PAL like US did. Union's PAL system only worked on the command chain level, and the remote launch command was only one of multiple options.
They feared that the US may attack the PAL link component, and it will prevent the launch. The same reason lead to mobile launchers being made one man operable, though even colonel level officers had little knowledge of the system operation besides "press buttons like on this picture if given code word blah-blah"
It is good that now we have Ukrainian launch officers that can divulge information on Soviet launch tech. The part of strategic rocket forces that stayed in Russia managed to keep secrecy perfect for 30 years.