Thank you for all of the comments. Very helpful!
I agree with the idea to keep it simple and not burden people with unnecessary rules. On the other hand, we also need to ensure a safe environment.
ItsBrian, I enjoyed your comment! I suspect that you feel the youth protection training is "common sense" because you've had the training multiple times and grew up in a troop where it's enforced. I also want my senior scouts to feel that it's "common sense." I can assure you that, to people without your background, it will not be common sense.
After this discussion here and with members of my troop, I think I'm going to propose the "required" sentence to be only BSA rules.
By "recommending" that all parents and senior scouts take YPT, I hope that we can create an environment where YP becomes common sense. Yesterday, I talked with my older scouts who have taken YPT (for summer camp staff), and they said it was helpful. They encouraged keeping older scouts in the "recommended" category. Few parents or scouts will actually take the training if they don't have to. But by recommending it for a broader group, it will create the common understanding that YP is everyone's responsibility and anyone can take the training.