I've had some crime. One night sitting here around 2AM, I saw a face appear in the window to my back yard peering inside my house.
I indicated I had seen him and to go around to the front. Surprisingly, he did. Not the safest thing but I talked to him and he made up a ridiculous story about trying to talk to the owner of a car
for sale and must have the wrong house.
Obviously, lying but what were the choices. I let him go (if I had a gun, I'd probably have detained him for police) and called the police.
If he had fled, I do not think it's right to shoot him in the back.
Another time, living on a 'closed street', after having been burglarized while sleeping, I saw a suspicious young guy on a bicycle who seemed to just be scouting houses. I asked him where he was going, he did not walk to talk. I got in my car and trailed him a few blocks, just to say, 'you are noticed'.
He was on his cell phone. Then, he stopped and I stopped and watched. A minute later, a guy around 40 arrived to meet him. He tried to act tough, but they left.
The next day, I had a knock on the door and a third person, a young guy with what looked like a gang jacket on, was on my porch and started screaming about how his friends had better be left alone, and I didn't know who I was dealing with, and that he was "Diablo". After a minute of that, he walked away. I called the cops.
I've learned there are whole networks of criminals who know each other and help each other. I could tell several more stories along those lines.