After the list they mention 3 Euro cities that had 0 murders. I have visited 1 of them. Vaduz Liechtenstein. I am happy to report it is a pleasant place. At the time I visited in 1996 the border between Switzerland and Liechtenstein was just a marker with no checkpoint at all.
"Austria is one of the safest countries in the world. According to the OECD Factbook of 2006, levels of robbery, assault, and car crime are among the lowest in the developed world, and a study by Mercer ranks Vienna as the 6th safest city in the world out of 215 cities. Violent crimes are extremely rare and should not concern the average tourist. Small towns and uninhabited areas such as forests are very safe at any time of the day."
Source: Wikitravel