I agree, a good pocket knife is a great purchase!
One thing for readers to keep in mind is that unless you know how to fight with a knife (and know that the assailant doesn’t have a firearm), then it’s a very bad idea to brandish a knife even as a threat. If the assailant is able to disarm you, then you’ll be in a much worse situation than if you didn’t have the knife at all.
Of course not, don’t be foolish.
Inserting oneself into another’s bubble without thought or tact can make one come off as creepy or threatening.
All it takes is thinking with your eyes, ears, and brain rather than your dick.