+1. America has immense sociopolitical inertia. It is absolutely incomparable to societies like 1930s Germany, 1910s Russia, or post-war China that gave rise to the brutal dictatorships of the 20th century. This a blessing if you are worried about totalitarianism, and a curse if you are hoping for deep structural reform.
A reasonable worry is not that America is going to become just like China, Russia, or Nazi Germany, but that it will become a bit more like them in some ways. Which I think would be bad.