According to one of the other articles I read, the assignment was to expose students to view points they might not have encountered. He said he talked to the teacher and she agreed to the topic. He gave the presentation, took a few questions from classmates and said it caused no issue at the time.
While I know it can be a lighting rod, it should not be something where administration requires an extensive psych eval and gets to the point the student drops out of highschool to get a GED. Heck I had to have a psych eval for a position of trust and it was half that amount of time. Given that the police cleared it, the school district seemed to go way overboard in their reaction.