The point you keep skipping over is that there doesn't need to be criminal charges for Bama to suspend him. He took a weapon, at 1:30 in the morning, to two team mates that was used to take the life of a young mother. If he had used the great upbringing that he supposedly had at Cane Ridge, he would have realized that was a really bad idea. Instead, his actions directly led to the death of that girl.
Most schools would have realize the terrible PR they would be facing by continuing to play him and would have suspended him. It wouldn't have done much to his upcoming lottery pick, but likely would have taken Bama off the short list for the final 4. It is no surprise that Bama chose the win at all cost route. It is totally consistent with how they have handled problems with their athletes in past times.