Bah!!! This reminds of when I had to keep quite about being an athiest in school because it would be offensive for me to air my views.However it wasn't considered offensive to make me organise a Christian based Assembly.
It's not a teacher's job to push their opinions or to step outside the national curriculem guidelines.Also anyone who foments racial hatred in the workplace will be breaking the law which will lead to disciplinary action.They can hold their views but if they demonstrate them or try to express them they will be reported.After all the students DO know their rights in this respect.Insult one of the ethnic minorities students racially and they won't stand for it.I would also report them if I heard any such behaviour.However as long as they don't use any propoganda in the workplace they are entitled to their viewpoint and to keep their job.