See I hear this part a lot but I know that Kessler was supposed to address some of the credible evidence language in the personal conduct policy and there were some twitter sports lawyers pointing to that language as well. The rest of your post is wrong too but I'm just curious about that specific language.
In cases where a player is not charged with a crime, or is charged but not
convicted, he may still be found to have violated the Policy if the credible evidence establishes that he engaged in conduct prohibited by this Personal Conduct Policy.
And here's no less an authority than Mr. Kessler, who btw has been running circles around the NFL and all the internet lawyers since he stepped onto the scene, arguing exactly what you are denying.
https://mobile.twitter.com/i/web/status/905173194667151360
If he's right here, and he references previous decisions in there as well where the NFL used that language, then the whole focus only on Roberts and the process seems poorly aimed. It seems that if they can make that case the league has no shot but everyone only focuses on the process aspect.