I too have been fascinated by this.
It's always been true of human nature: the desire to reach some sort of conclusion as quickly as possible.
Humans seem to have a lot of trouble with uncertainty, and when faced with uncertainty we tend to concoct narratives that are informed by our perceptions of reality. The danger of social media is that such narratives can spread quickly to others, and a mass delusion can be formed based on faulty or incomplete information.
This is a lesson that shouldn't be new to social media, because "proper" news outlets have made horrible mistakes in early reporting many times as well, but it's worth noting: never, ever blindly assume that you've heard the whole story, no matter what the source. This is doubly true if the story you're hearing seems to imply that one or multiple actors are a combination of incompetent and malicious that stretches credulity.
Humans make decisions for reasons, and although we all make mistakes, usually we're not malicious imbeciles.