The nap, IMHO, just shows that he probably knew he was going to be impaired and was hoping sleep would help. it didn't... would it have been that hard to get a ride from someone else?
No; of course he was breaking the law; of course he could have gotten a ride.
I personally am not in a position to sit in judgment on him because of what I mentioned before--how I nearly fell asleep on the road. And part of me finds it unjust that what I did(driving tired) was not illegal, even though it was in many ways worse than what he did. And so I feel there should be some more objective criteria for(and education about) impairment, not that impairment should be legal.
Violating traffic laws is a pretty good objective criteria. People who are drunk usually either drive significantly slower or significantly faster than the speed or traffic, which is grounds by itself for being pulled over. If they cut someone off, change lanes without signalling, etc., they can be ticketed and a breathalyzer can be administered, and if they're impaired because of tiredness, it's still reckless driving, and still illegal.
I don't like how the checkpoints are used in the particular part of VA I used to live in because the police always used to ask where people lived, even after looking at the driver's license, and I thought they discriminated based on what kind of housing you were living in. The local government is corrupt enough that they claimed a lot of older(and less expensive) housing had to be torn down in order to build the new Wilson Bridge; but instead of using that land for anything public, they have started building million dollar condos on it. They put sobriety checkpoints on a particular road and devote large numbers of police to questioning everyone who drives down the street, and they aren't particularly respectful even though they stop people who haven't violated any law. I personally think they're trying to harrass people they consider undesirable into moving away from the area.
It sounds like you are an extremely bright person with a very good unbringing who has made impeccable decisions. That is wonderful; my upbringing was more of a "drink coffee if you're going to be driving late or tired" sort of thing. I personally know no one who was injured in a drunk driving accident, and yet I know two people who were involved in severe crashes because they fell asleep at the wheel, so it skews things for me. My thinking is, Oda was awake at the wheel; his vehicle had a driver who may not have been perfectly alert, but was at least conscious enough to make his best attempt at driving safely. His DUI was illegal, and deserved punishment, but he did not compound the DUI by breaking traffic laws. Driving a moped makes a difference to me. Of course it can cause a fatal accident, but even the slightest collision with the actual moped is likely to cause serious injury or fatality in the driver, which makes it less likely that a driver would attempt to drive aggressively, which is a different issue than driving drunk.