This will probably be downvoted too, but, golly gee, I'm just trying to have an open mind here and seeing if someone can convince me that MCD should be at fault. A hot product is hot and inherently carries those sorts of risks. Yes, it was hotter than it needed to be. I get that. So what? How is it some sort of gross negligence? (That's a real question, not rhetorical--I don't understand. 180-190 is not out-of-this world hot, but yes, is extra hot compared to 160 degree coffee).
My newborn example in the grandparent post still applies if served at a cooler temperature. They'll get burned right away. And for adults? The temperature coffee is served at all coffee shops everywhere can be inherently dangerous and cause 3rd degree burns (see page 3 http://www.ameriburn.org/Preven/ScaldInjuryEducator%27sGuide...). While people may not understand the specific number of seconds required, they get the gist--be careful with hot liquids.