This is a different point than what was being argued, though. My first post in this thread was arguing that special fear of black strangers over white strangers was much less reasonable than special fear of male strangers over female strangers. I was responding to someone who thought that thinking that men have a special responsibility to not make strange women uncomfortable commits you to thinking that black people have a special responsibility to not make strange white people uncomfortable.
If you want to argue that people fear strangers too much in general, you're welcome to go for it, though I'm not sure this is really the thread for it. Maybe you're right insofar as people are bad about thinking about low-probability events, and we tend to treat them as being nearly impossible or as being much more likely than they really are. But it'd be wrong to cast this as women being notably irrational; this is just something everyone does, and probably we should accommodate it in specific instances rather than telling particular groups of people to not be so anxious, at least when it doesn't carry unfortunate baggage.