OK, I will accept that premise, from which it follows that if the whole class skips over these parts of the material, then everyone's understanding is hurt - so

OK, I will accept that premise, from which it follows that if the whole class skips over these parts of the material, then everyone's understanding is hurt - so what are you going to do? It seems the choices are either that we accept that certain people should avoid certain topics (which is not a controversial position when the topic is, say, mathematics) or that all potentially-disturbing topics are off-limits (at least mathematics will probably survive in that case.)