1 & 2: Clearly someone with problems. I'm willing to bet that it was not received terribly well by many of the players, as well. In my experience there are idiots like 44.  They are part of a group, but not necessarily liked by the majority.  A lose screw, no doubt.

3. The biggest problem in many social circles is the group mentality that prevents critical thinking and expression when one moron in a group is clearly deserving of it.  For example, the brotherhood of police seem to have a similar problem when coddling their own bad actors.

4.  It is good question.  My own experience, as a Freshman I was a football player and a frat member at the Lax / football / hockey house. We had a national incident my Freshman spring that made the NYT involving a mannequin with a sexist epitaph scrawled on it with spray paint. The mannequin was originally from an art installation somewhere else on campus that made its way to a Toga Party at the house. At some point it was spray painted. Then, after hours of lying around, it was hung (with some effort) from the front porch (around the torso, not neck), party center, by a drunk member, where it stayed until the next a.m. where a sober member of the college community saw it the next a.m. crossing campus, who then notified the authorities.

No doubt there were a few problem folks in the group, which was definitely not helped by a college policy prohibiting the organization from limiting membership. Anyone who wanted to join was allowed -- much to the chagrin of most members.  Bad apples were the extreme minority, yet the sullied the entire reputation of the house. Their behavior was disliked by the majority and never rewarded.

Yet there was loyalty of friendship with these same folks from the majority.  For what its worth, many of the worst actors were from shitty family situations (abusive) and dealing with serious personality problems masked by alcohol abuse (the latter, of course obvious in hindsight).  

re the incident, the majority of members were angry about the spray painting.  The individual who hung the mannequin claimed he did it not as any statement, but because he thought a mannequin hanging from the front porch would contribute to the zany atmosphere of a Toga party.   Few members really paid attention to the what was spray painted on said mannequin.  The college consequently banned the Frat for the year.  

The offending members (in this incident or other acts of stupidity) were still accepted as "brothers".  While much of the membership felt wrongly persecuted as a group for the actions of a few, the membership also felt punishment should have been reserved for those individually responsible.  Members prone to stupidity were generally looked down upon.  A contradiction of sorts, yes.

But to the point, the subculture didn't find it acceptable or support it.  In fact, generally the word would sink in that it was "f'd up".  My response to the whole brotherhood mentality, however, was to drop football, play Rugby and deal mainly outside the fraternity.

Sorry about the rambling... lots to say, no time to edit.

We should be clear that they "allegedly" screamed racial slurs at the woman, even if it seems very probably.  We should also consider that perhaps it was a screaming match involving ill considered behavior on both parts -- e.g. perhaps the slurs were flying both ways given the women involved appear to be hardly above reproach.

All that said, I feel sorry for boys re what happened afterward -- but with extreme reservations.  Don't go looking for trouble, it'll find you soon enough is as old as the hills, and these fella's put themselves in the situation.  

Their documented, known actions that evening are hardly gentlemanly or anything any respectable parent would like to learn of their children.  With three boys of my own, I can say that I'd be very disappointed.