It's a testament to Airbnb's PR that the people quoted here don't know about previous issues like:
http://gawker.com/man-unwittingly-rents-out-apartment-on-air...
http://www.businessinsider.com/airbnb-host-cant-get-squatter...
http://gawker.com/man-unwittingly-rents-out-apartment-on-air...
http://www.businessinsider.com/airbnb-host-cant-get-squatter...
Most people know someone who rents out property, and have heard horror stories like this. Laws and eviction processes tend to error on the side of the tenant for good reasons. So it's the responsibility of the landlord to know the rules and the risks. Just because the match was made with AirBnB doesn't suddenly absolve you of risk or responsibilities.
This is not to 'blame the victim', the renter seems like an asshole. For a long time I rented out my house to many roommates, and I've had some bad ones where lawyers needed to be involved. It's often hard to spot an asshole upfront and sometimes impossible to spot a sociopath, no matter how good your interview process (or AirBnB rating system) is. And life circumstances can turn a friendly renter into an evil one. But I knew the risks... namely that in CA it can take 6+ months after a problem occurs to get someone evicted, and your chances of getting paid for that period are very low.