Let's say that you were driving home 10km above the speed limit, and that resulted in you having a vehicle crash that caused a fatality.
Hey, but absolute morality says "thou shalt not kill"
Well thou certainly didst kill, but thou claimest that thou didst not mean it
Society may take the view that if you deliberately flouted the law, then you committed the act of homicide by default.
Ok, we'll change it to 60km above the speed limit. Maybe you could make the argument that your reckless behaviour was more clearly related to the final outcome.
Add to that the fact that you had been drinking, and were too intoxicated to realise that driving would be too great a risk.
It all comes down to risk factors. We take risks all the time in life, and sometimes the 'gamble' doesn't always pay off.
A lot comes down to whether society standards agree with your personal risk assessment or not.
An absolute moral code in which everybody who causes the death of a person, is treated the same, is clearly not viable.