Sadly I don't have time for a lengthy debate now/today.
I'm not trying to debate, and the fact that you see it as such is more to my point. I'm just saying yes there are still people who support him and they do have their reasons.
But here are some remarks.
Trump is an insider. Trump is part of the deep state. Only his rhetoric is deceiving. The tax cuts for billionairs prove that. He does not give a shit about the average Joe and Jane. He is a fraud but he talks like an average dude and people love his charisma and his punchiness.
I think DeSantis would have been the smaller of two evils he would have at least admitted a defeat. The GOP elites were aware how dangerous Trump is after Jan 6th but they fell in line because MAGA is too powerful.
Whether he's an insider or not, again, is in the weeds and I'm not going to debate you. What matters is the perception. You literally just said the elites failed to replace him, meaning his supporters who want to go against the bush/Cheney/McConnell crowd see him as an outsider.
You see January 6th very differently from Trump supporters. Again, not saying you're wrong or right. If you actually want to understand why people support him, though, you need to accept that.
I would not put trying to impeach someone in a legal way in the same category with murdering a president. There are reasonable measures and just insane actions. One has to differentiate here. Prosecuting someone because someone actually committed a crime should be a reasonable action. Otherwise people (or presidents) get a "get out of the jail free card" for almost everything. Which is seemingly the will of the Supreme court.
They don't see the prosecutions as legitimate, much like you seem to disagree with at least some of what the supreme Court has done.
I'm trying to help you reach a point where you can say, "ohhhh, I see why they support Trump, it's based on X/Y/Z assumptions I disagree with and A/B/C information I think is false. Now when I talk to a trump supporter I can jump to those pieces of information to understand why we have different conclusions."