Actually, we do know that people are like this. It's a phenomenon with a name that's
widely studied and
researched.
The murder of Kitty Genovese is the most well-known case.
I mean, I'm sure you've heard of the Bystander Effect, so why it is so insane that she's pointing out that it happened to her and that it is a thing that happens at large? She's not blaming anyone or putting the responsibility on anyone just because she's being forthright about her contradictory and, as she admits herself, hypocritical emotions.
Oh wait, I forgot. Bystander Effect is liberal propaganda. Duh. :rolleyes:
edit: This has nothing to do with a certain type of mentality (people don't imagine themselves not helping in these scenarios), and the existence of firefighters and police is irrelevant. No one is saying that it is not in our human nature to want to help others. It's about group behavior and group psychology. Obviously there are always exceptions, and I assume (don't know for sure) that this phenomenon is more prevalent in urban, densely populated areas, especially since the more bystanders there are, the less likely people are to help (diffusion of responsibility).