I think your saying that fans (and anti-fans) have too much bias to be part of a legal process and I agree. That's why jurors are vetted before being seated. I'm trying to give my opinion outside of being an OU fan. I might not be interested if it were a USC player, but I think I would feel the same.
I was following the threads on LT about this incident and the ones that seemed the most credible said the back and forth between Mixon/Molitor started well before Picklemans. It was all verbal up until then, but Mixon was no angel during the escalation. Take with sacks of salt.
As far as "punishing" someone for being strong and powerful, that's not the case. At least not directly. The DA himself said that ultimately, Mixon was charged and Molitor was not due the respective damage inflicted. So legally, each person is accountable for their part of the outcome. The physical mis-match gets factored in implicitly. If Molitor happened to be some kind of Ninja warrior and broken Mixon's face with the 360 flying swan kick, she would have been charged. So Mixon was not charged for being a brute; he was charge for using that prowess for violence.