It is not natural to expect EVERYONE to be anything. When you know nothing about something though, it is the stereotypes that give you first basis of info to work on to see about more. Even if it is only to see how much they differ. When I run at something I have never faced before, and if I have some stereotype about it, do I use it? yes I do, specially if it is something potentially dangerous, till I know more about that particular thing. And deep down, when such things happen, so do you and about everyone else. This is how our own nature protects us.
Another discussion we need to have at some point is Man VS nature. We are part of nature same as everything else you know :p