@Marilyn29
Read Airbnb terms and condition, it’s completely your own responsibility, could you not tell by their profile that these people (Guests!) were trash.
This is the beauty of the Airbnb’s system, from Airbnb’s perspective, they get circa 20% fee without any risk of damage or liability, while Hosts on the other hand, gets a fee, lots of very hard work, and huge risk of damage and liabilities.
You'll read some hosts intone these events are minuscule compared to the number of successful hosting’s, well my answer to that is, Why if that is the case do Hosts find it practically impossible to draw down on the Host guarantee? in fact I’ve read of some Hosts that could take up a career in the circus, the number of hoops they had to go through to get a resolution (resolution centre don't get me started on that!)