It makes not difference if they are full nutrient or full of all kinds of nasties, If they started banning stuffing like energy drinks it would open a whole can of worms. There are a lot of things that are bad for us, it is up to each person to be able to govern themselves on what they eat and drink. If they did do anything, they would put a age requirement, due to the possible harmful properties when too many are consumed in a certain amount of time. That could be acceptable because a lot of children don't read warning labels. Same with alcohol and cigarettes, have to be a certain age to buy.
As for me, Caffeine does not really affect me at all. I rarely drink soda's or carbonation, I prefer tea, but I can sleep right after with no problem. I do like Mountain Dew, monster and venom's, when I want something carbonated, but I prefer the monster Rehab's if I am going to drink something regularly. Don't know why, but caffeine has never really affected me. On the other hand, my family can't drink it if they want to sleep, they will be energized.
If someone is allergic to something and then eats it, you are not going to sue a company for his/her stupidity. People are responsible for their own actions.