From that exact same article:
http://www.dailycamera.com/news/boulder/ci_25390118/alex-lewis-ex-cu-buffs-lineman-sentenced-45
"I have no doubt alcohol was a major factor here," (Boulder District Judge) Butler said. "This was a classic example of too much alcohol, too much testosterone, bad result."
Lewis... lost his football scholarship but told Butler he is doing well in school and has acknowledged he has a problem with alcohol.
"Day in and day out, I thought about what I did...It scares me to know I had an impact on someone else's life, hard to come to terms with the fact that I had a problem, but I did get help. ... Off the field, I've grown exponentially as a man."
That's tough stuff for a 21 yr. old to come to grips with. Another great read about his road back from that night:
http://espn.go.com/college-football/story/_/id/11466333/alex-lewis-path-nebraska-cornhuskers-was-anything-smooth
"Alex Lewis' darkest moment of the past 16 months did not come in prison.
His darkest moment came in a Colorado courtroom as he listened to testimony from the family of Bussey, who suffered after the assault from the effects of a concussion.
"It's hard on me, as a person, to hear another family struggling because of you," Lewis said. "Not only that, but a son struggling. I can only imagine my mother crying the same way. I'm sorry for it. I'm growing up, and I'm learning from it."
Sometimes really good people do really horrible things under the influence of too much alcohol. Like Ray Rice, he's paid his dues and then some. If the Ravens, looking at the last three years, believe he is sincere, and deserves another chance, then maybe we should, too.