Considering Brazil and Mexico make up cities that cover the top ten in murder but appear to show positively in this graph, I'm skeptical.

https://en.m.wikipedia.org/wiki/List_of_cities_by_murder_rat...

I've spent significant time in South America and I can categorically say that people are happier and friendlier that the northern americans. Being in a high-crime area doesn't mean you don't have life satisfaction, with your extended family living nearby and your basic needs met, and the fine weather and food.

It's a well known fact that Latin American countries rate themselves as subjectively happier.

Probably http://worldhappiness.report