I do not like political correctness, but this is far more than that. These issues are heated for many good reasons. There are just certain subject matters you do not touch with a ten foot pole, and that if you must do so, you do so extremely carefully. Ironically, if there is one thing I have learned about this sort of subject matter with History (be it Slavery or Holocaust), it is that you must immediately ignore what the (typically extremely liberal) Education theorists have been discussing for the past 40 years: do not make it hands-on. You roll out the accepted lessons from history or even the mythology of it and do little to challenge it. You do not want the trouble on yourselves or the administration, or even the students or parents should you perform with haste and inadequacy.
Let the real learning occur later when passions are somewhat cooler, the students are more mature and patient, which can allow for intense professional and self-study.