If you're talking about renting out a room while you also live there, I can definitely see that reducing the risk. The article seemed to be talking about people subletting out their apartments while they're out of town, though. People around here do do that, but incidence of major damage is not that infrequent (it seems to be a favorite topic of the local paper, and comes up every few months). Often, people require damage deposits to mitigate the risk from that, which AirBnB doesn't seem to allow.
In particular, since I'm near the beach, people like to rent out apartments and houses for bachelor parties, spring-break trips, graduation parties, etc., and those can end up causing significant damage, occasionally in the $10k+ range (beer-drenched walls requiring drywall replacement and repainting, etc.).
I don't really have a lot of choice about whether I'm worried about carpet stains or other damage, anyway. If there's damage when I move out that wasn't there when I moved in, my landlord will charge me for it. It's not a fancy apartment by any stretch, but I'm still not allowed to damage it.