Terrorist incidents in America at the beginning of the year, questions raised on security

This year in America has started with firing, blasts and murders, despite which America calls itself the safest country in the world. When the whole world was having fun during the New Year celebrations, terrible incidents were continuously happening in America. More than 15 people have died in these incidents so far, and this raises the question as to why so much violence is taking place in a country that claims to be the safest. Video