Almost all of those cities are in Red States controlled or with significant numbers of Republicans in state office. How much power does a single mayor have? Several also allow firearms to be carried. Miami-Dade County had 200 fucking murders last year and you celebrate it as some panacea of vigilantism...
What about the Liberal cities in Canada? What are their murder rates? Right! Because you can't just go buy a gun in the US and easily get it across the border. Anyone can buy firearms in Virginia and easily smuggle them into NYC, even though the "Democrat run" NYC has a relatively low crime rate for it's size...
Also, the top 25 safest US cities are nearly all in Blue States...
https://www.adtsecurity.com/resource...es-in-america/
The overall crime rate in the United States has dropped steeply since the 1990's and has ebbed and flowed for the past century and even if you had an unfortunate experience in Vancouver, you're still about 70% less likely to be murdered in Canada than the US, and it's mostly about the ease of access to firearms here...