This has been absolutely beat to death. But hey, lets go over it again because clearly people are missing the point:
1 - You are not going to blow over .05 after having two drinks with dinner, unless you are a small person and drink those two drinks in the span of an hour and proceed to drive.
2 - It doesn't matter if those people who are between .05 and .08 are KILLING anyone. The fact is, they cause collisions and a number of other road related hazards that don't necessarily culminate in death on a regular basis. Which incidentally, in a ridiculous metric for the usefulness of this law. Even if the government uses it, it's a stupid point of reference.
3 - Enforcement of current laws is happening, and let me remind you, just because something isn't happening in front of your face doesn't mean it isn't happening. Checkstop runs 365 days a year, barring issues, and is a very effective program. However, to have more buses would require more money... which I won't get into because people don't support such crazy notions.
This is about risk management involving a very real problem, and minimizing hazards to the public. Just because the percentage of collisions caused by people driving in this category of BAC is relatively small, whether they cause death or not, it still costs everyone in a number of ways.
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Any writings in this forum are my personal view and all opinions expressed should be taken as such; there is no implied or direct opinion representative of anything but my own thoughts on various subjects.