I am appalled by the idea of suing the providers of things used abusively. It was wrong for booze. It was wrong for tobacco. It's wrong for fatty food.
However, I can understand why these two kids would sue McDonald's. I mean, I'm opposed to such things on principle, but I imagine that if a lawyer approached me and told me I could make millions of dollars by filing a lawsuit, I don't know that my principles are that strong. Millions of dollars.
That's a hint, by the way.