Airbnb Denied My Claim With No Explanation

I am a Superhost who has provided Airbnb with dozens of stays since January. A recent guest completely trashed our place. I have photos of destroyed blankets, towels, electric mattress pad, and cigars. Our house reeked of cigar smoke despite our clear and strict no smoking policy. Our carpets and mattresses required additional professional cleaning and many items needed to be replaced.

After immediately filing a complaint the day she checked out, I never heard from the guest or Airbnb. Many phone calls later, I finally received a message from Airbnb stating my claim was denied and that their decision was final, with no further explanation. What is the point of clearly establishing house rules and taking a damage deposit if Airbnb has no intention of protecting the hosts from damage?