I have always had a weird tire fixation......When I walk through a parking lot, I tend to give all the tires in view the once over.
Since I tend to park out a ways, I generally see at least one tire that I would not drive on, per passage through the Home Depot or grocery store lot. Bald, cracked, or just plain way low tire pressure. How these people make it home is beyond me.......And why they are not stacked along the interstate, waiting for AAA is a question I ask myself often.
Tires have a whole lot more margin built in than they did back a couple of decades.....At least, that is my conclusion. Because people in general don't pay near enough attention to the only thing between their vehicle and the road.