I'm gonna blame the system here. We advertise alcohol on every medium, we party with alcohol, we sell alcohol with dinner, we sell alcohol at sporting events, we sell alcohol at clubs, we give alcohol for presents, we have alcohol at celebrations, we drink alcohol at weddings, and even churches serve alcohol in some occasions, etc.
It's just no surprise that we have DUIs, because our society is 100% set up to create the situation. It's just like car accidents at intersections. Those aren't really accidents, they are collisions just waiting to happen.
Now he could have made better choices, but let's not kid ourselves that too many of us have and continue to make the same dumb mistake he did. I'm not excusing his behavior, as he's a leader and should know better, but we as a society clearly don't really walk the talk, nor will we ever until cars are fully autonomous.