The 1950s was a totally shit decade with nuclear escalation and underlying social problems in the US acting like a pressure cooker ready to blow up. Why the hell would people even want to go back to that?
Because white people were constantly assured of their superiority via segregation and other means and never had to worry too much about minorities getting too uppity?
To steal from one of my favorites:
Bobby Kennedy: "There are people in every time and every land who want to stop history in its tracks. They fear the future, mistrust the present, and invoke the security of a comfortable past which, in fact, never existed."