My personal experience with alcohol suggests that the impact of intoxication the evening before a game would have a much more profound impact on the physical tasks a player is expected to perform than on the mental, emotional and motivational tasks coaches are expected to perform. Legal activities conducted by people on their own time in their own homes are their own business. JT didn't cross a line getting ****-faced; the line was crossed, allegedly, when he committed violence against another.
That's your opinion but it still looks very bad on JT's behalf when it comes to telling the football players to stay out of trouble. That's two big strikes against JT: domestic violence and being intoxicated the evening before games especially before the WSU game. Suppose JT was in fact arrested before the WSU game, the media would be having a field day on that.
Given CU's history back in the early 2000s with the rape scandal, I wouldn't hesitate to fire JT if I was RG/MM. Not worth going through that media firestorm again.