There's a vast difference in death risk between driving 20 miles a day by doing it at 30 mph through a city (like where I live in DC/metro area) and driving 20 miles a day on a highway at 75mph.
Same for GA. There's a vast risk difference between VMC in a fixed gear single in the south and IMC in a twin in Alaska.
The only point is, all these "per mile" estimates are almost useless to judging individual risk within a given situation. As a pilot, you can mediate a lot of risk built into the statistics just by what type of plane you fly, conditions, terrain, etc.
BTW, the 5x more dangerous stat is actually conservative. I've seen studies say 16x more dangerous then driving. In reality, it's either a lot more dangerous then that or a lot less dangerous, as flying has so many more variables you can actively adjust vs. driving to mitigate risk.
My argument had nothing to do with persuading anyone. It was my opinion of how variable the situation is for the benefit of our discussion.