elchase

And it points out that speed was also a contributing factor. Darkness, weather, and waves are often contributors too, but we can't control those. What we can try our best to control is the human factors; like speed and alcohol. By the logic you are apparently using, should we not have laws against DUI just because we still have a few who break them? If we did not have those laws, then those who are caught breaking them can't be convicted at all. If this guy was just below the limit, he might have walked. If he had fled the seen and waited two days until his blood cleared to turn himself in, he might have walked. A speed limit might not always prevent the accident or be enforceable in every case, but it is another deterrent and can often be another tool for the prosecutors.
If there were no offenders we would not need any laws at all...but unfortunately, and as this forum shows so often, there is always going to be a handful of scofflaws. We saw this summer and last on Winnipesaukee that when the MP is measuring speeds, almost all boaters keep their speeds reasonable...and that will always save lives.