I did some googling and this was my first hit -- https://mikedropsports.com/ranking-12-saddest-sports-cities-in-north-america/ As you can see, there are many sad stories, but Minnesota is ranked as the saddest city.
Then I came across a site that rated Detroit #1 and Minnesota # 5 -- https://www.trainwrecksports.com/the-top-10-worst-sports-cities-in-america-1-5/
I think that the difference boils down to how much weight is given to making the playoffs versus winning championships. It's been a long time since a Minnesota team won the championship in a major sport -- the 1991 Twins? And during that time the Vikings, Timberwolves and Wild have been disappointing.
All of that said, if there is such a thing as karma -- and I believe that there is -- the negative attitude of fans may be having some effect. I wish that there was some way to change that. Any ideas would be appreciated.