Name one aspect of our society that has an "airtight" policy where snafu's don't happen? I can't think of one.
I agree that airtight problems can't be 100%. However, the parents or emergency contact person should be called when a change in transportation is made. That is not too difficult to do and an easy policy to make. Parents getting upset and bringing in the media is sometimes the only way to get things done.
In my niece's school ineptness is the norm. This happens every year. Because of tenure and unfortunately affirmative action *here* bad teachers can not be fired. One way that the local school boards get rid of them in the classroom is to move them into administration. Policy making is not their strong point. It takes common sense and most are lacking in that department.