Lots of tough talk about shooting them, but then you end up in jail as another George Zimmerman...headlines calling you an “evil, vicious racist who shot a sweet honor student.”
Ok, shooting might be a possible response but what are others. IT is the element of surprise there that makes it work for them.
George Zimmerman is still alive. Let them call you names or even prosecute you. It is still better than the alternative.
I would say that depends on what you shoot them with. A paint ball gun loaded with blue leather dye or itching powder would be an interesting solution.
Yes they could sue you for “damages” but you could counter sue for damages to your shop.