Why are the crime rates so high in these cities? It can't just be a result of poverty or unemployment? Tasmania's median income is lower than some of these cities, though our unemployment rate is lower than all the cities.
I'm no expert on Tasmania. But I'd say a major difference and reason is diversity of population.
I'm not sure about that, as the City of Toronto had 61 homicides last year. This is a city with a population of 2,503,281 (as of 2006), and where nearly 50% of the population is non-white, arguably the most multicultural city in he world. And that's as-of 2006, again, by now I suspect whites are a plurality in Toronto, not a majority.
Similar numbers hold true for Canada's other immigration centres, like Montreal and Vancouver. Here in Ottawa (est. population of ~900,000, 23% non-white population) we had seven homicides in 2010. In fact, Canada's highest homocide rates are in Saskatchewan (4.1 per 100,000), one of the least diverse provinces. I don't think diversity has any significant effect on violent crime rates in most countries.