If police get even a large fraction of drunken drivers off the road, at most they might save a few hundred lives.
If police get even a small portion of drunk drivers off the roads, thousands of lives will be saved. 
mnli hypothesis: If police get even a small portion of drunk drivers off the roads, thousands of lives will be saved.  premise: If police get even a large fraction of drunken drivers off the road, at most they might save a few hundred lives.