Thanks guys for respond. In return, I'll tell You a story.
In February this year in Warsaw, capital of Poland, about 10AM a bus stopped at bus-stop. Drunken teenager picked up a trashcan and threw it into bus' window. The glass shattered. One man stood up - a policeman after duty. He showed badge and called the teenager to calm down. On the bus-stop, there was also second teenager. He had knife, he killed that police man. This kid was 18.
Now the best bit: policeman had no gun, because in Poland law forbids policeman to carry a weapon after duty. They have to leave it at police station.
Murderer is still (we have October!) pending to be trialed. He may get 25 years, lifetime with some luck (for us, normal people - in Poland there is no capital punishment for murderers). After that incident, in polish media serious storm started. You know about what?
"Carrying knifes should be forbidden, just like in other European countries".
You don't know, how lucky You are, You live in USA