St. Louis, Detroit, Flint, Milwaukee, Houston, Albuquerque, Phoenix, Tucson, San Bernardino, Los Angeles, San Francisco, Oakland, Anchorage, Washington DC, Atlanta, Indianapolis, Wichita, Baton Rouge, New Orleans, Kansas City, Newark, Buffalo, Cincinnati, Cleveland, Philadelphia, Memphis, and Nashville are all more dangerous than Fresno or Jacksonville and all have Democrat mayors and most have Democrat City Councils as well.
Out of the top 50 most dangerous cities in America, only Corpus Christi, Tulsa, Lubbock, and Stockton CA are run by Republicans for a total of 4 cities. Syracuse NY has an independent mayor, but the City Council is all Democrat, so they go in the Democrat column. I wasn't able to verify which party controls Pompano Beach FL, Modesto CA, Vallejo CA, North Charleston SC, or Odessa TX for a total of 5 cities. That leaves 41 Democrat-run confirmed cities or 82% of the list.
And browsing Wikipedia
82% of the 50 most dangerous cities are run by Democrats. 82%
Let that sink in...