Nuclear war

I watched the film "Keepers" and thought - why has a nuclear war not started yet? Well, after all, thousands of rockets all over the world are standing - why hasn’t any bug happened for so many years and has the rocket itself not flown yet? well, or at least not exploded?

Well, let's say everything is clear with the Union rockets - well, there is a permanent memory on the needles made of them, and with the rest, why are there no incidents? cruise missiles have a really powerful software. proapdatel it as-nt crooked and aha - flew away.

Are there programmers who write software without bugs?