Let's say a user was to ask about how to reduce crime in his street or how to reduce shoplifting in his/her business, is this the right place to ask about it? It is not about questioning on what is legal to do or not, just what can be (legally) done to improve security.
From the original question author:
Can it be solved using a device that is not a weapon?
- Yes: DIY.SE
- No: Is the target a child?
- Yes: Parenting.SE
- No: Is it in the work place?
- Yes: Workplace.SE
- No: Martial Arts.SE