It's not like these parents couldn't get into any schools, they wanted a specific school and couldn't get in. Let's face it, these parents tried to bully the school and lost. I dont know if they overdosed on stories of parents who did anything for there kids chinuch or they were just being arrogant.
Did they ask a rov or rosh yeshiva about this grand plan? It seems like they have a strong sense of right and wrong so they probably did...