If you don't like the answer a ranger gives you, just call back and ask another. :)
Seriously though, neither Crater or Snowmass Lakes are listed in Exhibit A so a ticket wouldn't hold up anyway. It's very specific as to what sites are affected. But I think bear bagging is just common sense. Or a canister if you want to carry one.
My buddy and a friend were there last week and the pics were spectacular. Tons of wildflowers and very green. Should be a great trip.