So things were better with the KKK running rampant, Hitler rising to
power & starting WW2, segregation, financial collapse, prohibition
causing the organized crime problem, no gay rights, etc?
I think you're confusing the 1920s with the 1930s. Membership in the KKK peaked in the 1920s, yet started to decline in the decades following. Prohibition was ended in the 1930s, but was in force all during the 1920s. The financial collapse also happened in the 1920s, caused by capitalists, while FDR had to slowly repair the damage - and was quite successful at that.
FDR changed many public policies, and a lot of attitudes did change during that period. People developed more of a global social consciousness which planted the seeds for further changes later on, in the 1950s and 60s. @PureX can correct me if I'm wrong, but I think that's what he may have been getting at.
So things were better with Jim Crow laws, McCarthyism, rapidly
increasing risk of nuclear war with USSR, the Korean War, people
being sickened by lead exposure, building poorly designed nuclear
reactors, no seatbelts in cars, forced Christian prayer in public
schools, no gay rights, etc?
Things were improving and attitudes were rapidly changing during the 1950s. And remember, it was the capitalists who embraced the anti-communism which led to McCarthyism, the Korean War, and the increasing risk of nuclear war with the USSR. No one else would have any reason to be that fanatical against communism, unless they were capitalists who had something to lose.
As for the Jim Crow laws, the 1950s saw the Civil Rights movement start to gain enough momentum to directly challenge those laws and other institutions of racial injustice. The KKK had a brief resurgence during this period, although many of them tried to justify themselves by claiming that they were "fighting communism."
As for people being sickened by lead exposure, poorly designed nuclear reactors, and no seatbelts in cars - I suppose one could blame capitalists for this as well, although they didn't know as much back then as we do now. Humans learn through trial and error.
It's fairly clear that you & have very different values.
To me, the "good old days" weren't that good.
I say that greatly improved civil liberties, scientific &
technological advancements, are progress.
If this is "sinking deeper and deeper in the mire", then
gimmee more of that mire.
I'll grant one looming problem....over-population.
The problem is not so much a hearkening of the "good old days" but even back then, there were people who were living through difficult times, but had a shared goal of getting through them and making the country a better place. While it may have been worse, once the public was awakened to the problem and saw the task ahead of them, they came together and made the collective effort to make it happen.
In terms of real economic growth and noticeable improvements, the 40s, 50s, and 60s showed much greater expansion and real wage increases than we've since that time. It might have been even better overall, if not for those in the ruling class who appeared to have a deep obsession with communism and the Cold War. If we had taken a live-and-let-live approach with the USSR, PRC, Vietnam, Korea, Cuba, etc., we could have saved ourselves a great deal of national angst and heartache.