I mean, as a citizen of the U.S., I'm about as confused as you are. Though, if I had to guess, a couple of things really came to a head to make this second term possible:The establishment Democrats really screwed up on presenting a galvanizing candidate and sufficiently distancing themselves from Wall Street/Corporate interests. Trump may have lied his ass off at workers in swing states, but even though he had no intent/means to deliver half of what was promised, the man ended up telling people things were shit, while the Dems were still saying the experts were saying everything is the best it's ever been.
Once in Office, Trump has become much more dangerous due to actually having the architects of Project 2025 behind the scenes orchestrating things. He was "contained" by ineptitude in his first term, but a lot of power brokers all got behind getting behind someone sufficiently corrupt so as to make a major facelift of U.S. foreign and domestic policy tenable. And the worst part about it is that it's all been enabled by the cooperation of the Courts, and the Legislature not mustering the will to rein either of the other two Branches back onto some semblance of sanity.
I cannot say I have ever felt like I'm a stranger in a foreign land (in my own country of birth!), than I've been over the last two to three years. Don't know if this potential has always been festering under the surface, and I've just now hit the age where I can actually see it or what; but even my parents are flummoxed at the direction things have gone.