Wrong. Detroit is a good example of how to kill off a city by Progressives.
In Detroit, the government continually increased social spending on all sorts of programs attracting an underclass to the city that was supported by those programs. In Detroit's case, it was mostly Black transplants from the South. In order to fund these programs, the government continually raised taxes on citizens (sales taxes, property taxes, etc.) and corporations within the city boundaries. Tack on government policies that favored unions and forced union membership that was increasingly seen as unnecessary by workers.
The result of this was the workers, who had increasing personal mobility and decreased need for government public transit, moved to the suburbs and exurbs where they could commute in their personal vehicle more efficiently than by public transit, moved out of the city center and away from increasing poverty, crime, and other social problems attracted by persons coming to get social benefits from the government. That took their tax money with them and the city now found it was in a spending deficit spiraling towards bankruptcy. That led to government raising taxes on those that remained to cover that loss, leading to more flight from the city.
The same thing with corporations. As unions priced their labor above market value and taxes went up they were incentivized to move plants to new locations with cheaper labor, no unions, and lower taxes. This was particularly true as their existing plants became obsolete and costly to upgrade. Better to build a whole new plant elsewhere than fix the existing one.
It was Progressive Democrat government that did in the Rust Belt. It is Progressive Democrat government that's doing in California and New York. It was the inability to see ahead by Progressive Democrats that if you milk the 'cash cow' too often it stops giving milk then dies off rather than gives an endless supply of milk.
