First of all, I thought your post was excellent and I largely agree with it. Second, it's well known here that I supported Trump over both Biden and Harris.
However, I do think there can be SOME crossover between the morality of a president and SOME policy decisions and/or SOME relationships with other politicians (domestic or foreign). For example, I wouldn't want someone with no regard for the integrity of the nuclear family deciding what the family laws should be, or a convicted rapist dealing with a female foreign head of state who had been raped herself.
The problem is that Trump critics never try to make this kind of practical connection between what Trump is alleged to have done and what he says he plans to do as President - which includes getting the border under control, pursuing across the board tax reductions, reducing wasteful government spending, removing America from as many foreign wars as possible, and removing the obstacles to rapid improvement of the American economy. What have his alleged misdeeds to do with any of that? Nothing, in my opinion.
Politicians inevitably are not nice people. They are almost all insufferable narcissists. The best you can hope for is that what they actually DO improves some aspect of life for citizens.