The rationale, which I am a bit worried about, is that the unspoken norms of how American politics has always operated are getting decimated. If some sort of positive reinforcement loop gets established... But more conscious awareness of these norms and how important they are is only better. Read up on Masha Gesson [1]. I think it is more apparent exactly how aberrant the GOP has become and that is a good thing. But a clear and present danger, like he's going to hand America over to Putin next year? No, there is enough pushback going on that I am not very worried. As long as eventually, someone publicly goes to jail...

But now I am reminded of the Bush years when a survey of 18 year olds found most of them thought the First Amendment should be limited in some overly strict way... it was something like that - it was nothing like the understanding of things when I was 18, so yes, society's morals or what constitutes "common understanding" can shift in response to current events. Trump needs to be seen as a serious aberration, not just a speed bump, and this needs to be communicated to the under-18 crowd.

[1] https://en.wikipedia.org/wiki/Masha_Gessen

Because he seems to be actually creating an oligarchy in the USA, firing and hiring people for top administration like he sees fit in order to concentrate power around him.

This doesn't seem plausible to me; it will take him through his first term to fill a critical mass of these positions; he'll be in his way out before he gets there.

Let's hope so that he doesn't have time, but I think people are fooling themselves by thinking he will get voted out of a second mandate. If he lasts that long without an impeachment, history tells us that it's highly improbable that he loses the election for the 2nd term.

Even if he did get a second term, I have to wonder how much harm he could do. I have a hard time believing it's as bad as some people make it out to be. For all the grief our form of government gets, it is pretty robust against tyranny.