I don’t feel like the comparisons to Hitler are useful, at least when talking about the current US administration. There are lots more recent examples — Russia in the early 2000s under Putin, Hungary under Orban, South Africa under Apartheid — where democratic norms were gradually eroded, and the international community just sort of sighed and said "oh well, the people have spoken".
Military power is necessary, but political influence is bought with soft power and diplomacy. The reason USA has military bases over most of the world. Places which allows America to have places to "store" all that military might outside the USA is because it has allies. The Russian loss of their Syrian bases is a good example or what happens when you lose that soft power. That same soft power is also the reason American brands can sell their stuff globally. Basically the entire American entertainment industry and all the foreign aid programs are giant advertising ventures, selling the American lifestyle. When that soft power is gone, America will still be capable of getting it's way in many cases through threats. People don't respond well to that though. With USA rivals more than happy to step in, you shouldn't be surprised to see Coca Cola replaced by some Chinese cola brand sometime down the road. This is obviously a semi ridiculous example, but I think it's a good illustration if what could happen. That same thing will affect US tech dominance as well. Here in Denmark companies are now actively looking for exit strategies from the American cloud because of the increased risk. I don't think anyone seriously expects something to happen, but at the same time, there is nothing companies hate more than risk. The reason Google Cloud never made it in Europe is because it has more risk than Azure and AWS, and with European alternatives having caught up... Well...
What is perhaps even worse is that the only reason the USA can function with its current deficit is because of the Dollar. If BRICS succeeds in moving half of the worlds population away from the Dollar, the American "empire" will fall considering it's the only "empire" in the history of mankind which has been capable of maintaining it's world dominance while also increasing its deficit.
Hitler and Nazi Germany might be the example everyone knows, and Musk performing his "gesture" doesn't exactly help matters. There doesn't seem to be a real long term plan behind what the aristocracy in the US is doing right now though. At least not one which will keep them safe from each ohter or society as a whole. Berlusconi and his buddies never went to prison after all, no one fell out of a window and so on.