Last jury I was on we convicted a fellow for DUI. He was on a motorcycle, doing 90 mph or so on narrow back country extremely curvy roads with blood alcohol level at least 1.8 times over legal drunk level two hours after apprehension. He had had prior DUI's. I don't think he was wearing a helmet, either.
There is no logic or punitive measures which will stop a person judgmentally and physically impaired if they are willing to take such risky actions where the consequences, primarily, will be to themselves. A crash at that speed would surely send the rider thru the nearest barb wire fence and leave them in several pieces. If someone doesn't understand this risk and shrink from it, what external legal risk would reach him. Oh, yes, his drinking buddy was with him and didn't stop him (great buddy!) .....they wanted to "blow the carbon out" of the motorcycle.
My heart continues to go out to the OP, his family and the other victims of this event. Wish I knew how to inhibit drunks from getting behind the wheel. I have seen mangled cars on display along roadsides. I think the OP has a good idea there....never know how far reaching, time wise and behaviour wise, such a display might be.