in the mind of the average person, there is statistically little chance of killing someone while driving drunk (i mean, intuitively i think if you go out and drive 100 miles drunk its several times more likely you will get pulled over than to actually kill someone). so you take a relatively minimal risk against an astronomical cost of 20 years in jail.That's why I like my idea. You don't hurt anyone while you're driving drunk, and it's not a crime. You kill someone, and it doesn't matter if you're Jesus Christ who just had a couple beers and it was the first time you'd ever driven drunk, you go down for 20 years...
current DUI laws make it a relatively high risk, weighted against the low-moderate cost of spending a night in jail (and the whole nightmare a DUI is).
the 2nd seems much more of a deterrent, since humans arent very good at weighting cost/benefit as it approaches infinity.