I think SGB means if you won't walk alone at night purely because you are female. As she says in the title of the thread. Doing so purely because of being female (or owning a vagina) and purely because it is dark outside IS a distortion of risk, IMO.
I have been sexually attacked by a stranger (who turned out to be a repeat offender) at noon in a busy street on my way to work. I have been followed home after dark at least three times that I know of, I walked home at midnight every night on a predictable route. I had my own stalker for over a year, which was vaguely entertaining. I have been flashed at on a bus in the daytime. I have been physically attacked BECAUSE I was with a man outside a shopping centre, a gang of lads decided to start on him and there I was too. I have had someone kick the window of my car through whilst I was in it. A man attempted to assault me at twilight when I was on my way home from the supermarket, bags in each hand. I was raped in someone else's flat. I've been physically assualted several times in my own home though never by a partner.
There really isn't a common denominator in my experiences. With a man, without, in the day, in the evening, in the night, indoors, outdoors, sustained interest or one off attacks, people I knew, strangers. On foot, on buses, in my car. As a child, as a teenager, as an adult. Some of these people were prosecuted, some weren't.
I think refusing to do something arbitrarily because of certain factors when the statistics do not support those as particular risk factors is a bit daft - and I certainly resent being told what to do by others, because of these imagined factors. So I do have sympathy with being told you shouldn't be scared, I hate being told I should be!