You don't get it?

How would you, in a similiar situation prevent me from taking from you whatever I want? See, me and my buddies here, we're hungry. And we're thirsty. And... we're bigger than you. So, if you'll just step back, you won't have to bleed. Thanks. Have a nice day.

You can't call the police (based on some reports, you may be defending yourself from the police). And if I take what you have in this situation, you'll most likely die. So... now what? Good thing you don't have a gun... wouldn't want to escalate the violence any.