Do you have other substantiation for its tiger repellance? In which tiger-dominated environments has it been tested?
The whole point of the tiger/rock parable is that the testing has all been done in environments devoid of tigers.
Similarly, the mugger-avoidance strategies I could offer to User:perturbation are all 100% effective since I've never been mugged... but I have no idea whether the opposite strategy would have been equally effective.
When people talk about self-defense, they tend to concentrate on how to physically defend yourself. But the best way to avoid getting hurt is to avoid being attacked in the first place. Here are some suggestions:
What are some other easy measures that people can take to make themselves less of a likely target?