Certainly we should be striving for objectivity. But our political divisions run deep, and many people have a hard time seeing the other side's point of view. Your assertion that "[i]n Trump's world objectivity is not a goal" is indicative that you aren't open to the possibility that he's being more objective than you think, therefore, if your view is less objective than you think, then clearly you're part of the problem. Of course, maybe you're right, but you don't seem open to the possibility that you're wrong. And that simply illustrates my point about the difficulty of arriving at objective truth in matters where we're so deeply divided.

I may seem "closed" to the possibility that Trump is being more objective than me. Then again we all have over 3 years of observations on which to base our conclusions.

I will be interested, and open-minded, when reading your treatise explaining how one could conclude that Trump has been an objective reasonable President.

Ah, but I wouldn't argue that he's an objectively reasonable President. I would argue that there are people who believe that he is, and that we all have to be open to the possibility that either (or even both) sides are similarly objective as to their view of that question.