You make some excellent points, and the Nazis took a few years to get to their very worst policies. The roots of the Final Solution started around 1936, when they first embarked on a program to euthanize mentally and physically handicapped citizens.
Yet the Nazis' first moves upon taking power happened very quickly, such as the Enabling Act, which consolidated power in Hitler's hands (HitlerPig actually did the same thing sooner than Hitler did). The Nazis used a blitzkrieg strategy on their own government, before they employed it as a battle strategy, and the MAGANazi's are doing the same thing.
Sure, the Nazis didn't do everything, everywhere, all at once, mostly because it all takes time. Today, with the Internet and social media, it can happen a lot faster. HitlerPig is moving fast, but they still have strategies and policies that they will release over time, because even with the Internet, some stuff still takes time. If you want to detain massive numbers of the opposition, you need a place to hold them, so they have to wait until their 30,000 inmate facility in Guantanamo Bay is finished.
Fetterman was a good candidate, until his stroke. Studies have demonstrated that stokes often lead people to adopt conservative values, and that seems to have happened to Fetterman.
However, we should pump the brakes on his resignation. He is still a Democrat, and he adds to the close minority that Democrats have. He fulfills a similar role as Manchin did in the Senate. He may support the Republicans now and then, but he still gave the Dems the majority, which kept the Dems in charge of all committees, including investigative committees.
The Dems have the possibility of gaining the majority in Congress with just a few more seats. Mike Waltz' seat is up for grabs in Florida, and it was considered a safe Republican seat, but it is being challenged by Josh Weill, a Dem who is running a vicious Republican style campaign, and the Reps are extremely worried it might flip. Weill has raised 10x the money of his generally disliked Republican opponent, and still has about 10x the money on hand for the final stretch (April 1 is the election), versus about $100K for the Rep. Weill commercials, which look and sound like Republican attack ads, and never mention that Weill is a Democrat, are flooding thebairwaves, with very little response from the opponent, whose entire campaign is based on supporting HitlerPig. A few flips like that over the next year or so, and the Dems might get the majority.
Of course, Weill is still at the mercy of the Florida election system, which is fully rigged. I doubt DeSantis will let Weill win. Sorry to piss on the parade.
The bottom line is that Pennsylvania is a bright purple state, and very unpredictable. If Fetterman resigns, he might well be replaced by Republican, putting a Dem majority even further away.