Maybe it's not.
It doesn't change the fact that South Africa has the highest rate of violence against women in the world and one of the highest rates (it's usually #1, #2 or #3 depending on the year) of sexual violence against women in the world.
If you rely on reported statistics a woman gets raped in South Africa every 4 minutes.
If you instead look at the figure that the government and NGOs think is actually an accurate representation of their rape crisis it jumps up to a woman being raped just about every 36 seconds (note that the vast majority of rapes, 8 out of 9, go officially unreported for a number of reasons).
Studies conducted by South Africa's Medical Research Council have shown that something like 25% of South African men have committed rape and 50% of those have raped more than once.
It's estimated that 40% of South African women will be raped in their lifetime.
All of these statistics and estimates are readily available on the Internet from any number of reliable sources.
Feel free to look around and edify yourself.
What I'm implying is that when you're a woman, and you travel to a place where rape is endemic and of crisis proportions, you should probably be a LOT more careful than to go out by yourself for a jog in a place where it's possible for someone to pull you in to the bushes, out of sight.
If you want to imagine that race is a factor here I'll respect your right to speculate all you want.
But you'll notice that I have not, not once, neither here nor in my previous comment, mentioned race once.