As I said above, I don't think that the judge said anything that implies prejudice. I don't know what it's like in Ireland, but it's fair to note that in the US, defendant's don't get treated with a great deal of deference by judges in this country. Judges treat defendants sternly, and broker no BS. If we agree that no person is above the law, then even an ex-President doesn't deserve to be treated more deferentially in a court of law than anyone else.
As to your first point, that's going to happen, anyway, and already is, whether warranted, or not. A solid case has been made against him, with nothing stating that he doesn't have First Amendment rights. In fact, it specifically states that he has the right to state publicly that he thinks the election was stolen from him, that he thinks it was rigged, etc. What he DOESN'T have the right to do is act on his belief, in a manner designed to illegally disrupt the peaceful transition of powers, or conspire to take away the legal votes of others. That does not stop his lawyers from trying to make a case in public that Trump is being deprived of his 1st Amendment rights, (he is not,) nor keeping his loyal followers from believing the same thing. No matter what happens in this case, or the others, there is a certain percentage of the population here that will still see it as a political witch-hunt. That doesn't mean it's not worth doing.
If we were a 3rd world country, what happened on Jan. 6th, 2021 would have been seen as an attempted coup. Some people in this country believe that's not possible here, and choose to believe the narrative that it was a "peaceful" protest, or, at least, some version of Trump loyalists gone rogue, but to no real harm. What part Trump had in trying to disrupt the peaceful transition of powers is a big deal, if he did. What part he had in trying to find delegates to overturn the actual vote in their states is a big deal, if he did. If the law in this country turns a blind eye to it, because it seems too complicated or too political to deal with, who are we?