They list the methodology at the bottom of the article. When people talk about how dangerous a city is, they're talking about things like (to quote the top comment at the time of this post), "assaults, armed robbery, open air drug use, murder, etc."

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They're not talking about COVID vaccination rates, potholes on the street, and "perception of safety based on Numbeo website visits." I'm not saying these things don't matter, I'm saying that these are two very different conversations. This is a crap article and a crap list that literally tells people nothing about how dangerous DC actually is.