Also, isn't it also an area where professional and ethical obligations require you to be able to make the strongest possible arguments that you're capable of on behalf of your client... even if you personally find your client to be extremely distasteful. Lawyers literally need to be able to play devil's advocate, so I think it would be perfectly reasonable to not only require lawyers-in-training to be exposed to ideas opposing things they feel "should not be up for argument," but even argue against those things themselves as an exercise.