A lot of people don't understand this honestly, it's not about intelligence, it's not even about being good or bad.
The reason we are against him is because he has conflicting interests with the people. He works for the oligarchs, for capital, not for humanity, not for the environment, not even for american citizens.
And my 2 cents on this discussion is that critiquing him for being a convicted felon and about the other cases he is accused of is a really disorienting and weak critique as well. He is not going to make our lives miserable because he is convicted, he is going to make our lives miserable because he is a far right, neoliberal fascist with no respect for human life. And on the contrary, many activists have been convicted of crimes, like Assange, but I'd do anything to have them as president. Having been convicted is practically irrelevant and highly dependent on the crime.
So instead the critique should be targeted at politics, not on personal issues... But then again the fact that the critique doesn't always focus on politics is indicative a lot of times of the very small ideological gap between the two parties and how none offers any real alternative.