Just ask yourself what you'd do if you were living in the early days of Hitler and someone said Germany needed to be cleaned up. This analogy seems to answer several of your questions.
Or if someone says "make America great again", today. I mean who doesn't want America to be great?
I deny this rhetoric; you can use it to justify all kinds of wrongs. I can't tell you what I'd done if I was living in the early days of Hitler, because I don't have that context, while I do have the hindsight. Comparing Hitler with the current US administration seems a bit of a stretch to me, even though I have strong disagreements with some of the things that Trump/MAGA are doing (or _seem_ to be doing. At this point it's hard to trust anything anymore). On the other hand, there's a serious question to be asked, had we not been on a descent to madness for more than a decade before the current administration?