> This is a tricky task, requiring carefully shaped explosives, and pretty unlikely to happen by chance
It's not "by chance," the warhead is carefully designed to make it and everything needed is already there, there are no missing parts. The "software" maybe doesn't activate the parts optimally or at all if there's luck but nothing is missing inside.
In the given case, "only" the rocket body exploded (with the fully functional warhead on it) even if it's not designed to do so, and only because of one single fallen small piece of metal (a single socket).
It's not "by chance," the warhead is carefully designed to make it and everything needed is already there, there are no missing parts. The "software" maybe doesn't activate the parts optimally or at all if there's luck but nothing is missing inside.
In the given case, "only" the rocket body exploded (with the fully functional warhead on it) even if it's not designed to do so, and only because of one single fallen small piece of metal (a single socket).