I didn't see the NBC story, but I did read the on-line news story, maybe a week or so ago, when there was a lengthy (and somewhat heated) discussion of the incident on Teachers.Net. If I remember correctly, one non-teacher and one former teacher supported the school board while everyone else applauded the teacher for having the guts to resign.
The way I see it, the principal (who's in the school daily and who knows the course, the teacher, the students, and the situation much better than any of us -- and also better than than the school board members) supported the teacher's decisions regarding the zeros and the weighting of the assignment. So did the superintendent. Only the school board, a group of non-educators who are not in the school on a regular basis and whose positions depend on making voters happy, second-guessed the teacher's professional decision and the principal's and superintendent's professional opinions -- and then they gave no reason whatsoever for doing so, other than "parents complained."
The school board apparently caved into parental pressure. I hope they find out that teachers -- and parents of students who DO follow the rules -- can apply just as much pressure. And if this happens, I hope the story stays in the news so that school board members around the country will learn that caving into parental complaints isn't always the route of least resistance.
All this, of course, is IMHO only.