Bad policies create competitive disadvantages for jurisdictions that adopt them. The left, which is addicted to ideologically driven bad policies on multiple fronts, typically seeks to nationalize bad policy to shield leftist policy misadventures from competition. Federalism at the state level and local autonomy at the municipal and county level tend to create a policy market. They create real diversity and real choices, and allow people and businesses to vote with their feet.
It is far, far easier for a lobbyist and an activist and a communist to convince ONE national level group of bureaucrats in ONE department or agency in ONE hearing than 5000 local bureaucrats, who in turn need to face 50000 local election-led politicians.
218 democrats can be told what to do by one decision, and six network news shows will do what they are told.
IF the news media were unbiased, or even openly biased but honest, then this new national-control-of-everything would die because of knowledge like this.