Not sharing course outlines is not going to help make this problem better. Better to face those groups head on than hide.
It observably does make it better.
A friend of mine was harassed by these sorts of groups for their teaching. They received death threats, hardcore pornography, and gore in their inbox from these chuds. The trigger was the availability of their course material online.
Why should professors face death threats head on? What are they going to do differently besides self censor?