he will never, ever, coach another program of Nebraska's statute ever again
"Stature"?
why it is unacceptable to act this way
You are confusing "acceptable" with "understandable". Either that, or you are intentionally switching the two in order to knock down a straw man of your own creation.
It isn't acceptable to use profanity at any time. That being said, it is understandable that people use unacceptable profanity when:
"They are as mad as H*ll"
"You scare the sh*t out of them"
"They are having a 'WTF' moment"
I heard my Great Aunt swear only one time, when she was watching Robb Schnitzler return his one and only punt that year 70 yards for a touchdown (does this date me?), telling him "Run, you sonofa...!" Unacceptable, but understandable...
Now, for those of you who are bound and determined to be outraged, you go right ahead. This is America, you have that right.
No, I am not. It is not understandable to use language of that type consistently to young men. It not understandable to ever use those words in a setting where you are to be a role model. It is not understandable, for a rational person, to act so much out of anger 2 days after this person was wronged. None of this is understandable.
It is, however, unacceptable. Unless, of course, you are a toddler. Then it would be understandable, because you wouldn't know any better. Pelini had the charge of being a role model to 120 young men and 3.1 million reasons to know better.
I am sorry you don't understand the definition of understandable and unacceptable. Furthermore, the fact you think any reasonably educated person could confuse those two things either is a terrible attempt at an insult or proves you are not the aforementioned type of person.
edit: You accuse me of a straw man argument, then bring up an isolated incident of a seemingly innocent person slipping up with a swear word. That is, of course, the same as a man who uses this as commonplace in his everyday vernacular.