Earlier quoted context omitted.
Because it takes 1 person, in an isolated spot to ruin a whole chunk of a network. Even though society as a whole works, there's things where one person can easily mess it up for potentially millions of people. So even if that person would have to be a big statistical anomaly, they'll exist.
Fortunately the people wanting to do that are often to stupid to realize what's vulnerable.
so does that make someone stupid because they're not an evil billionaire and just someone that likes to watch the world burn?