1) Completely unprofessional behavior and my guess is, the only reason she is a long term teacher is that the school simply cannot get better (sadly) or cannot fire her to due to union/contract issues (also sad.)
And if this child was indeed a special education child--I can only think that a) the teacher was off the chain b) the parent is in complete denial as well about the child's issues and perhaps expects the school to do it all for the child. Many people would be horrified to hear what a place of last refuge schools are for special needs children.
I'm not excusing the teacher, because that was inexcusable. But I'd like to know as well if the school district was providing adequate support for the child, or if the parents were reinforcing the expectations. Defecating in the classroom is not something that long term should result in this.
2) We get what we pay for with teachers. We expect college graduates to put in well over 40 hours of work for pay that is one to two thirds lower than comparable business fields--and far lower for technical math/science fields. Yes, teachers have more vacation, but when you add in the required training, the time off comes to perhaps a month--or less, given that setting up a classroom takes almost a week--or two--of time each year.
If we raise teacher salaries (and there is a lot to be cut in public education that would fund those raises) we could get a much higher quality of employee. The good teachers now are the ones that either choose to sacrifice or can afford to teach because their partners have a better second income.