From a teaching practice perspective, one of the things that most influenced my thinking on questions like these is a something I read by the head of a school writing about 100 years ago.
What she said was that students to learn are developing a relationship with the objects around them. Be it the natural world, political systems, ideas, books. It's important these things be alive to the students and the teacher can help with that, particularly by choosing the right kinds of books.
However - what the teacher has to beware of is stepping between the student and the material, so they themselves become the focus, their ideas, their arguments. It places a barrier between the mind of the student and the idea or object, and in a sense interferes with their right to come to determinations on their own, over time, through observation and contemplation.
The difficulty for teachers and parents in allowing this is twofold. One is that it's flattering to the ego to be the object of interest to the student in that way and to shape them - indeed students often love teachers like that. The other is lack of trust - fear that the student will not come to the "right" conclusion.
She saw this as a faith issue, as she was operating within a Christian context, lack of faith in the minds of the students and also lack of faith in teh ability of God to form a relationship with them.
But I see much the same thing with people who consider themselves non-religious around social justice issues. There is a lot of fear that if you don't make sure students have the right view, they may come to the wrong conclusions, be it about the Trump presidency or anything else. So they are very careful to avoid things like asking why people (and increasingly minority groups!) voted for Trump rather than the other options. It's even evident in the way teaching is presented to the students.