St Louis has had Democrat mayors only, since 1949. Having a look at the others in your list, Baltimore has had Democrat mayors since 1967, Detroit from 1962, New Orleans since 1872(!), Kansas City since 1991, Memphis since at least 1982 (the Wiki is not well documented), Cleveland since 1990, Washington DC since 1961 (depending on the definition of 'mayor'), Cincinnati since 1984, Newark since 1953, Buffalo since 1966. Buffalo is just before Chicago.
I don't think any mayor could do it on her own.
That does not resemble my argument, at all, and it isn't implied by anything I've said.
It's interesting--I looked up the population of Chicago when I read the story about the 77-shooting weekend. It's less than the population of Sydney. And so I looked up Sydney's shooting rate. I didn't find a like-for-like comparison, but Sydney probably has 150 shootings a year. The Chicago figure is astonishingly high for a city of any size. And it was a 'what the fuck' moment for me.
What the fuck.
Now, I realise it's not a 'fair' comparison. Australia's gun laws are completely different to the US. But more importantly, although I
would expect a mayor of Sydney to be active in any Sydney crime crisis, police in Australia are state-run affairs.
I agree 100% that gun violence in the US is about as fucked as a porn star during their last set of the day. Where we differ is in believing Chicago is the worst or even atypical. Baltimore and St Louis are far more dangerous and that generally comes from Republican Governors playing partisan fuckery with peoples lives towards Democrat run cities.
I didn't say Chicago was the worst. I mentioned Chicago because it had an astonishingly remarkably bad weekend even by Chicago standards.
Democrat administrations preside over the most violent cities in America, by per-resident violent crime rate.