This sound like you have always to be prepaired for dangerous situations in your country. Is this right? I would be sorry for you. We haven´t got so much crime here. At least no death crime. We have got more burglary delicts but most of them are payed by our insurance. And the neighborhood is always watching, if you know what I mean
so most delicts can be stopped by the police before they begin.
If there is a shooting delict, it is usually accomplished by organizations which fight against themselves. They don´t touch citizens because they haven´t dealings with them. They are known by the police, and they can not carry weapons just like that. If they would, than they would go to jail for carrying weapons. So they are always careful and hidden.
The most dangerous organization was the Hells Angels here. But last year the police closed every base and now they are forbidden by the constitution here. Most members are in Jail, the others had to remove the tatto´s and they are not allowed to carry any HA emblems. The police call it crime prevention.