Because, let's face it, you're not going to actually use that self-defense course you took.
1. You'll just wing it. "I've got this! I was in karate class, I know what I'm doing!"
2. You'll just run. Away from the situation. Away from your responsibilities. Away from your rent.
3. Self-defense is overrated. Who needs to know how to disarm a gun? That's just a bunch of fancy footwork!
4. You'll just call the police. Let them handle it. You're not a hero.
5. You'll just use your wits. And by wits, we mean your iPhone's GPS to find the nearest Starbucks.