Two boys killed a clerk in a convenience store

At a convenience store in Osaka, two juveniles killled a clerk. They were trying to stole bottles of beer from the store, and then the clerk noticed these two. He tried to catch them, and they killed him. This is a very sad news, because his act was nothing wrong. He just did what he shoud have done. If someone does something which is not right, people should warn him/her. I often hear news these days that someone did a bad thing, and there was a witness, then he/she killed the witness also. I think that those who kill a person think that they just need to kill a person if they do not like him/her. We now have to think about the preciousness of life again.